The game clock in basketball keeps track of the amount of time left in the current half or quarter during a game. The game clock differs between the NBA, NCAA, and other leagues. The NCAA plays two 20-minute halves while the NBA plays four 12-minute quarters. The game clock is the official clock used for all games and is displayed on the scoreboard. The game clock is mainly stopped for fouls, timeouts, and injuries.
NBA Game Clock
In an NBA game, there are four quarters that each last 12 minutes. This makes the total duration of an NBA game 48 minutes long. The game clock will start with 12 minutes on the clock and tick until it reaches zero. Once the clock reaches zero, the quarter ends. It will reset to 12 minutes for the next quarter.
College Basketball Game Clock
In college basketball, there are two halves, each lasting 20 minutes. With only 40 minutes of total game time, this differs from the game clock in the NBA. However, the rules surrounding the game clock and stoppages remain the same. The game clock starts and ticks until it reaches zero. Once the clock reaches zero, the half ends. An NCAA game clock starts at 20 minutes and ends at zero for each half.
Buzzer Beaters
A buzzer-beater is when a player makes a basket while the game clock hits zero. Usually, the term buzzer-beater is in reference to a game-winning shot, but you can also hit a buzzer-beater at the end of a half or quarter. As long as the ball leaves a player's hands before the game clock reaches zero, the basket will count if it is made. Buzzer beaters are rare, but when they happen in a game, they are exciting for fans and players.
Game Clock Stops
As mentioned above, the game clock always ticks, but it will temporarily stop when the ball is declared dead by a referee. Here are some of the reasons the game clock stops:
A foul or violation is assessed
A player is injured
The ball is carried or thrown out of bounds
A timeout is called
During free throws
A referee stops play for video review or to fix the game clock
After a made basket in the last minute of the second half or overtime (NCAA) or the last two minutes of the fourth quarter or overtime (NBA)
Once the ball is put back into play with a jump ball or throw-in, the game clock starts ticking again. The game clock starts once a player touches the basketball. It does not stop unless there is another stoppage of play. The game clock in the stadium is the same as the clock on television broadcasts. This can often lead to technical difficulties between the clock on tv and in the stadium.
Game Clock in Overtime
In basketball, the time put on the game clock for overtime differs from regulation time. In both the NBA and NCAA, the game clock is set for a single five-minute overtime period. In high school basketball, overtime is usually four minutes. However, if the score is still tied after the first overtime period, additional overtime periods will be added until a winner is decided. This can significantly increase the length of a basketball game. The rules for stopping the game clock in overtime are the same as in the fourth quarter of NBA games or the second half of NCAA basketball games.
FAQ
When does the game clock stop in basketball?
The game clock stops whenever a foul is called, an injury occurs, the ball goes out of bounds, during free throws, and for timeouts. In the NCAA and the NBA, the game clock also stops after a basket is made during the last two minutes of the fourth quarter, the last minute of the second half, or during any overtime periods. In each of these instances, the referee stops the clock and gameplay by blowing their whistle.
Does the game clock stop after a made basket in basketball?
In NCAA basketball, the game clock only stops after a made basket during the last minute of the second half or during an overtime period. In an NBA game, the game clock only stops after a basket is made during the last two minutes of the fourth quarter or during any overtime periods. In high school basketball, there are no similar rules regarding made baskets and stoppage of the game clock.
How long is the game clock in basketball?
The length of a game clock depends on which basketball league the current teams are playing in. For an NCAA basketball game, the game clock has two halves, each consisting of 20 minutes. For an NBA game, the game clock has four quarters, each consisting of 12 minutes. In high school basketball, the length of the game clock can vary by league and location, but each quarter is typically 8 minutes long. The length of a game will be longer than the time on a game clock due to stoppages and breaks between play periods.
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Pages Related to Basketball Game Clock
Basketball Game Structure
Basketball Double Bonus
Basketball Halftime
Basketball Dribbling
Basketball Field Goals
Basketball Illegal Use Of Hands
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Shot Clock in High School Basketball, Coach's Clipboard
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Shot Clock in High School Basketball - Yes or No?
By Dr. James Gels, from the Coach’s Clipboard Basketball Playbook
A controversial subject...
should there be a shot clock in high school basketball
? I'll try to present the background and pros and cons without inserting my own opinion.
Shot Clock Rule Definition
So what is the shot clock rule? It's a rule used to increase the pace of play. The shot clock is a defined number of seconds (24 for NBA, 30 for college) that the offense may possess the ball, once it is in their control or caught on an inbounds pass. The clock is reset when the ball touches the rim or goes into the basket, and when possession of the ball switches to the other team, such as on a rebound, steal, or violation. A shot that leaves the shooter's hand prior to the clock buzzer counts if made.
Why have a shot clock?
The main reason is to prevent teams from stalling, holding the ball for long periods of time to slow the pace of play and reduce the number of possessions. There are many examples of teams stalling the entire game, even in the first half, and even in state championship games.
Also, very common is for two teams to play hard and fast the entire game, but the winning team stalling out the last 4 or 5 minutes, resulting in fouling to stop the clock and many late game free throws. As coaching legend Al McGuire once said about these situations: "the clock is your enemy" - meaning nobody shoots except for uncontested layups. This type of basketball is not popular with many fans, resulting in fans yelling "play the game!" or "shoot the ball" or actual booing.
So why do some coaches use stalling? - because they can... it's within the rules and may help their team win.
The shot clock first came into the NBA in 1954, the 24-second clock. Former Celtic great Bob Cousy once commented that the game before the shot clock was good hard play for three quarters and then stalling the remainder of the game, with fouling and free-throws at the end. Fans didn't like it and attendance fell. Putting in the shot clock improved fan enjoyment, interest and attendance.
Women's college basketball put in the shot clock in the 1970-71 season, as did men's college basketball (1985-86 a 45 second clock, changed to 35 seconds in 1993-94, and 30 seconds in 2015).
NFHS (National Federation of State High School Associations) Rulings
The NFHS has always ruled against the shot clock. .. but the vote for approval is getting closer. If your state high school association votes in favor of the shot clock, it will be in violation of the NFHS rules. As a consequence, your state's association will not be permitted to serve on the national rules committee.
Regardless, eight states have approved using the shot clock - Massachusetts, New York, Maryland, Rhode Island, North and South Dakota, Washington and California.
Arguments Opposing the Shot Clock
Cost
Initial costs are somewhere between $2000 and $5000 for a shot clock to be mounted near the scoreboard or above the backboards, or as part of the main scoreboard itself. This can be a significant cost for athletic programs on a tight budget, especially small rural schools... but the small schools in the Dakotas have done it.
Shot Clock Operator
And then there is the shot clock operator. Will this be another paid position, a volunteer, or an additional official? And what about junior varsity and freshmen games. .. more strain on resources to have clock operators for all these games.
There can be disagreements with how the shot clock operator has reset the clock. Some training will be required. This article, "Duties of Shot Clock Operator" is worth reading.
It's not College or Pro Basketball
Some believe that high school basketball is unique from college and pro basketball. They believe that since only a very small percentage of high school players go on to play in college, the pressure to make it more like the college game is not valid. They feel the added expense is not necessary.
Fans
Some believe that whether fans like it or not is not relevant to the discussion... it's for the players.
Coaching Strategy
Coaches that like to control tempo and slow the game down state that using a shot clock takes away from coaching strategy. Slowing the game down helps teams with less talent pull off the upset win. .. so fewer upsets with a shot clock. Having a shot clock hurts the underdog, and scores could be more lop-sided (need for a "mercy" rule?).
They also claim that with a shot clock, there will be more teams sitting back inside and playing zone defenses. To counter stalling, the losing team should abandon their zone defense and apply pressure man-to-man to force turnovers to turn the tide.
Fundamentals
Some coaches believe that when forced to play fast there will be an erosion of player fundamentals, more turnovers and rushed, bad shots.
Arguments for Using the Shot Clock
Stalling
The shot clock will prevent stalling and the entire game, as well as the end of the game, will be more exciting.
Fans
Fans will enjoy it more and attendance will increase, which will help negate the costs.
Costs
There are additional costs, especially at first, but increased fan attendance and clock sponsors will help. And if small schools in North and South Dakota can do it, why can't everyone?
Player Development
Players that learn to play uptempo will become better overall players and will be more ready for the college game.
It's for the Players
Many coaches point out that the majority of the players themselves would prefer to play uptempo with a shot clock.
Regarding More Zone Defenses
Yes, there will probably be more teams playing zone defense. But teams that can play good defense for 35 seconds will be rewarded.
Demographics
One study indicated that the argument is also somewhat generational. Many older coaches are opposed to the shot clock rule, as they have coached that way for years. Most younger coaches have grown up and played the game with the shot clock rule and thus many are in favor of it. So if this is true, it might just be a matter of time that the rule will be instituted, once the younger coaches are in the majority.
How Long to Make the Shot Clock
30 seconds, 35 seconds, 45 seconds? The states that currently use the shot clock are at 30 or 35 seconds. Some think that a 45 second clock would be good enough to stop prolonged stalling.
Alternatives to the Shot Clock?
Since the main reason for having a shot clock is to prevent stalling, is there anything else that could be done instead? Some have advocated using the shot clock rule just in the last four minutes of the game... but the initial costs of having a shot clock and an operator are still there.
Should we somehow empower officials to prevent stalling??? If an official sees a team back the ball out to half-court and just hold it there for a period of time, could the official circle his arm around signaling that the offense must begin to play, and failure to do so would result in a turnover? We already have a 5-second closely-guarded rule, but it's seldom called. Could we enforce and perhaps modify that rule?
The shot clock rule is a controversy. I hope I got you thinking about how you stand on it!
Also see:
Duties of Shot Clock Operator
Shot Clock in High School Basketball – the Debate Continues
Time to Implement a Shot Clock in High School Basketball?
Apple Watch Workout Types - Apple Support (UK)
This article explains the types of workouts you can track in the Workout app on your Apple Watch.
Walking
Beg
Cycling
Ellipsoid
Ergometer
003
Yoga
Functional-blue training
Dances
Restoration
Cor-training
9000
Chair
Mixed
Other
Walking
To walk on a treadmill or indoors (for example, inside a shopping mall). To improve the accuracy of indoor walking pace and distance, you need to calibrate your watch beforehand. Take a walk of at least 20 minutes by launching the Workout app. Bring your iPhone with you to calibrate your Apple Watch Series 1 or earlier.
For activities such as walking on a stadium track or walking in a park, select Walking. Depending on your Apple Watch model, you may need to bring your iPhone with you to track certain metrics.
Pace and distance: Apple Watch Series 2 and later has a built-in GPS that allows you to track these metrics and display your walking route in your iPhone workout summary report. If you take your iPhone with you, the watch uses its GPS signal to extend its battery life. For the most accurate location using GPS navigation, hold your iPhone in your hand or attach it to a wristband or belt. For GPS on Apple Watch Series 1 or earlier, bring your iPhone. Apple Watch Series 1 and earlier let you track the pace and distance of your workout without an iPhone using the watch's built-in accelerometer. To improve the accuracy of these measurements, you must first calibrate the watch. Take your iPhone with you and go for a walk of at least 20 minutes by launching the Workout app.
Altitude: Apple Watch Series 3 and later models have a built-in altimeter. For height tracking on Apple Watch Series 2 or earlier, bring your iPhone.
Learn how to calibrate your Apple Watch here.
Running
To run on the treadmill or indoors, select the Running (Gym) option. To improve the accuracy of pace and distance tracking when running indoors, you need to calibrate your watch beforehand. Go for an outdoor run of at least 20 minutes by launching the Workout app. Bring your iPhone with you to calibrate your Apple Watch Series 1 or earlier.
For activities such as stadium running, trail running, or trail running, select the Running option. Depending on your Apple Watch model, you may need to bring your iPhone with you to track certain metrics.
Pace and Distance: Apple Watch Series 2 and later has built-in GPS to track these metrics and display your run route in your iPhone workout summary report. If you take your iPhone with you, the watch uses its GPS signal to extend its battery life. For the most accurate location using GPS navigation, hold your iPhone in your hand or attach it to a wristband or belt. For GPS on Apple Watch Series 1 or earlier, bring your iPhone. Apple Watch Series 1 and earlier let you track the pace and distance of your workout without an iPhone using the watch's built-in accelerometer. To improve the accuracy of these measurements, you must first calibrate the watch. Go for an outdoor run of at least 20 minutes by launching the Workout app and bringing your iPhone with you.
Altitude: Apple Watch Series 3 and later models have a built-in altimeter. For height tracking on Apple Watch Series 2 or earlier, bring your iPhone.
On your Apple Watch, you can choose how you prepare for a long distance run, such as a marathon. See the list of options below.
Power saving mode turns off the Always On screen during walking and running workouts and data transmission over the cellular network is limited. Learn more about Power Saving Mode.
You can sync music and podcasts directly to your Apple Watch in advance and listen to content even without an iPhone. For information about syncing content with your Apple Watch, see this article.
Take your iPhone with you. If you take your iPhone with you, you can use the watch's Bluetooth function for resource-intensive tasks such as connecting to networks, streaming music or podcasts, accessing Siri, and more.
If you are planning a long distance race in the evening, you can extend battery life by turning off cellular and the Always On screen feature. a few hours before the race. Learn how to turn cellular on or off and set the Always On feature.
For more information about battery specifications, see this article.
Cycling
For activities such as exercise bikes, select the Exercise Bike option. For cycling in open areas, select the Bicycle option.
Depending on your Apple Watch model, you may need to bring your iPhone with you to track certain metrics.
Speed and Distance: Apple Watch Series 2 and later have built-in GPS to track these metrics and display your ride on your iPhone workout summary report. For speed and distance tracking on Apple Watch Series 1 or earlier, bring your iPhone with you.
Altitude: Apple Watch Series 3 and later models have a built-in altimeter. For height tracking on Apple Watch Series 2 or earlier, bring your iPhone.
Ellipsoid
For elliptical training or similar activities, select Ellipsoid.
Ergometer
If using a rowing machine or similar, select Ergometer.
Stepper
If you are using a stepper, select the Stepper option.
High Intensity Interval Training (HIIT)
For intense exercise cycles followed by shorter periods of rest or recovery, choose the HIIT option. For example, you can jump rope for 45 seconds, rest for 30 seconds, and then repeat the exercises.
Some unusual movements during high-intensity workouts can prevent accurate heart rate measurement. Calorie tracking is done using the built-in accelerometer, even if the heart rate is unknown. If you can't get a stable heart rate during high-intensity interval training (HIIT), you can connect your Apple Watch to a Bluetooth-enabled chest strap.
Hiking
To track your pace, distance, climb, and calories burned, select Hiking. During the workout, you will be able to track how high you climbed in real time, and at the end of it, you will find out the total climb.
Apple Watch Series 3 and later have a built-in altimeter to calculate and display altitude, so you don't have to take your iPhone to workouts. For height tracking on Apple Watch Series 2 or earlier, bring your iPhone.
Yoga
To track any yoga activity, from recovery practices to power vinyasa flow, select Yoga.
Functional Strength Training
Choose the Functional Strength Training option when performing a series of dynamic strength exercises for the upper body, lower body, or full body as well as using compact equipment such as dumbbells, resistance bands and medicine balls and without equipment.
Dance
The Dance option is suitable for fitness dance classes, whether it be cardio, cardiolatin, hip-hop or Bollywood.
Recovery
Select the Recovery option after completing another workout if you want to continue light movement and stretching as you recover.
Core Workout
The Core Workout option is suitable for exercises aimed at strengthening the abdominal and back muscles.
Pilates
For machine or mat exercises that strengthen your core and improve overall flexibility, choose Pilates.
Tai Chi
For training based on this Chinese martial art, consisting of slow, meditative full body movements, select Tai Chi.
Swimming
On Apple Watch Series 2 and later, you can select either Pool or Water.* At the start of a workout, the screen automatically locks to prevent accidental taps of water droplets. Learn how to swim with your Apple Watch and view your workout history, including autosets and intervals.
Apple Watch rates each workout as follows.
Pool: When you start your workout, be sure to enter the exact length of the treadmill so that your Apple Watch can correctly calculate laps and distance. While swimming in the pool, GPS is not used. In addition, water can interfere with heart rate measurement, but thanks to the built-in accelerometer, the watch will still be able to determine the number of calories burned, laps and the total distance that you swim during your workout.
Body of Water: The GPS module will only measure distance when freestyle swimming. Water can interfere with heart rate measurement, but the watch will still be able to determine the number of calories burned thanks to the built-in accelerometer.
Chair
If you ride in a manual wheelchair, you can choose between Walking Pace Outdoor Walking Chair or Running Outdoor Chair Walking Pace. It is recommended that you choose a workout that best matches your activity, but maintaining a constant speed is not necessary. The speed can be changed during any workout. Selecting one option for workouts close to walking and the other option for workouts close to running allows you to track your workouts in the Activity app.
The Apple Watch measures activity as follows.
Apple Watch Series 2 and later optimizes tracking of wheelchair workouts with pushes (outdoors) at walking and running pace. In addition, these models are equipped with built-in GPS, so there is no need to take your iPhone with you.
Apple Watch Series 1 and earlier optimizes tracking of wheelchair pushing (outdoor) walking and running pace workouts. To view speed and distance, you need to take your iPhone with you.
Both wheelchair workouts measure time, pace, distance, calories burned and heart rate. To measure time, calories, and heart rate for activities such as hand-biking and wheelchair basketball, select Other.
During both wheelchair workouts, the Activity app tracks shocks.
If these workout parameters are not displayed, you may need to update the specified data.
Open the Watch app on iPhone.
Go to the My Watch tab and select Health.
Press Health Profile.
Click Edit, then select Chair and click Yes.
Click Finish.
Blended Workout
Blended workouts designed to prepare for duathlon or triathlon, Apple Watch motion sensors automatically detect the type of workout and switch between swimming, cycling and running in any sequence.
Adding a workout
You can view and add new workout types in the Workout app.
Open the Workout app on your Apple Watch.
Scroll down and select Add Workout.
Select the desired workout.
If you can't find a suitable workout type, select "Other". All training options use heart rate monitor and motion sensor data to accurately determine energy expenditure. If sensor data is not available, choosing "Other" or any of the workout types available in the "Add a workout" section will result in energy expenditure based on brisk walking.
Learn how to get accurate measurements with your Apple Watch to get the most out of your workout.
Additional Information
* Cellular signal on Apple Watch models with cellular connectivity may be weak during Pool and Water workouts.
Publication date:
Rule 3, 5, 8, 24 seconds in basketball and their violations
Hello, dear visitors of basketball-training.org.ua! Today I want to tell you about the most important basketball rules related to playing time. These rules are quite simple to understand and apply, however, as practice shows, many players do not interpret them quite correctly, which causes a lot of controversy.
So I decided to write an article that would dot the i's in questions 8, 5, 3 and 24 seconds in basketball rules . Let's start with the three second rule.
Rules of basketball: 3, 5, 8 and 24 seconds
Rule of three seconds
Quoting Official rules of basketball:
A player must not remain in the opposing team's restricted area for more than three consecutive seconds while his team is in control of a live ball in the frontcourt and the game clock is running.
An exception must be made to a player who:
Attempts to leave the restricted area.
Is in the restricted area while he or his partner is in the act of shooting and the ball is leaving or has already left the player's hand(s) on a shot for a field goal.
Dribbling in the restricted area for a shot for a field goal while in the restricted area for less than three (3) seconds.
To be considered outside the restricted area, the player must place both feet on the floor outside the restricted area.
Something to keep in mind: You can stand in the 3-second zone until the ball has gone to the opposing team. You can stay in the zone if your partner is throwing the basket. Well, to get out of the zone, you need to go out with both feet (and not one, as is often the case).
8 second rule
Let me quote the basketball rules again:
Whenever:
Player gains control of a live ball in his backcourt
On a throw-in, the ball touches or the ball is legally touched by any player in the backcourt and the team of the player taking the throw-in continues to have control of the ball in their backcourt, that team must bring the ball into their frontcourt within eight (8) seconds.
A team kicks the ball into its frontcourt when:
The ball, which is not controlled by any player, touches the frontcourt.
The ball is touched or the ball is legally touched by an attacker who has both feet in contact with his frontcourt.
The ball is touched or the ball is legally touched by a defender who has part of his body in contact with his backcourt.
The ball touches an official who has part of his body in the frontcourt of the team in control of the ball.
During a dribble from the backcourt to the frontcourt, the ball and both feet of the dribbler are in contact with the frontcourt.
The eight (8) second count continues from whatever time remains at the point of stoppage when the same team that previously had control of the ball is awarded a backcourt throw-in as a result of:
The ball has gone out of bounds.
Injuries to a player of the same team.
Jump ball situations.
Double foul.
Compensation of the same penalties against both teams.
What we pay attention to: both feet must go to the side of the opposing team, otherwise you will lose the ball. You can also throw the ball at the referee to avoid breaking the 8 second rule (just kidding, of course).
24 second rule
Before you read what is written below, you can read a very interesting article about how 24 seconds saved the NBA from discouragement: link.
And now let's turn to the original source published by the Basketball Federation (FIBA):
Whenever:
Player gains control of a live ball on the playing court
On a throw-in, the ball touches or the ball is legally touched by any player on the playing court and the team of the player taking the throw-in continues to have control of the ball, that team must shoot for a field goal within twenty-four seconds.
To consider a shot for a field goal taken within twenty-four seconds:
The ball must leave the player's hand before the twenty-four second device signal sounds and
After the ball has left the player's hand, he must touch the ring or enter the basket.
When a shot for a field goal is taken just before the end of the 24 second period and the 24 second device signal sounds while the ball is in the air:
If the ball enters the basket, no offense occurs, the signal is ignored and the hit counts.
If the ball touches the ring but does not enter the basket, no violation occurs, the signal is ignored and the game continues.
If the ball does not touch the ring, a violation occurs. However, if the opposing team gains immediate and obvious control of the ball, the signal is ignored and play continues.
All restrictions related to hitting and ball interference must be taken into account.
If the referee stops play:
When a foul or violation (but not when the ball goes out of bounds) is committed by a team not in control of the ball
For any other reason related to the team not in control of the ball
For any reason unrelated to either team, possession of the ball must be awarded to the same team that previously had control of the ball.
In the event that a throw-in is administered in the backcourt, the twenty-four second clock must be reset to 24 seconds. In the event that the face-off is administered in the frontcourt, the twenty-four (24) second device must be set as follows:
If there are 14 seconds or more remaining on the device when the game is stopped for 24 seconds, then the readings on the device should not be reset, and the countdown should continue from the time it was stopped.
If the twenty-four second device has thirteen seconds or less left when the game is stopped, the device must be reset to 14 seconds.
However, if, in the opinion of the referee, the opposing team will be placed at a disadvantage, the twenty-four (24) second count shall continue from the time of stoppage.
If the 24 second device signal sounds in error while either team is in control of the ball or neither team is in control of the ball, the signal is ignored and play continues.
However, if, in the opinion of the referee, the team in control of the ball has been disadvantaged, play shall be stopped, the 24 second clock shall be corrected and the ball shall be awarded to that same team.
Well, here the explanations will be superfluous, and so it is painted in great detail.
5 second rule
And this is the most interesting rule, often referred to as " tight player ". Almost none of the amateur players know about it, it is not judged in the framework of streetball tournaments (if you want to know more about the rules by which 3v3 are played in the Ukrainian Streetball League, read Streetball Rules) and in the USA it does not exist at all! So, what is its specialty?
Close Player
Definition : A player who is holding a live ball on the playing court is considered to be closely guarded when an opponent is in an active defensive stance no more than one meter away.
In each of these instances, the referee stops the clock and gameplay by blowing their whistle.
The length of a game will be longer than the time on a game clock due to stoppages and breaks between play periods.
The shot clock is a defined number of seconds (24 for NBA, 30 for college) that the offense may possess the ball, once it is in their control or caught on an inbounds pass. The clock is reset when the ball touches the rim or goes into the basket, and when possession of the ball switches to the other team, such as on a rebound, steal, or violation. A shot that leaves the shooter's hand prior to the clock buzzer counts if made.
This type of basketball is not popular with many fans, resulting in fans yelling "play the game!" or "shoot the ball" or actual booing.
.. but the vote for approval is getting closer. If your state high school association votes in favor of the shot clock, it will be in violation of the NFHS rules. As a consequence, your state's association will not be permitted to serve on the national rules committee.
.. more strain on resources to have clock operators for all these games.
.. so fewer upsets with a shot clock. Having a shot clock hurts the underdog, and scores could be more lop-sided (need for a "mercy" rule?).
And if small schools in North and South Dakota can do it, why can't everyone?
So if this is true, it might just be a matter of time that the rule will be instituted, once the younger coaches are in the majority.
Could we enforce and perhaps modify that rule?
To improve the accuracy of indoor walking pace and distance, you need to calibrate your watch beforehand. Take a walk of at least 20 minutes by launching the Workout app. Bring your iPhone with you to calibrate your Apple Watch Series 1 or earlier. 
To improve the accuracy of these measurements, you must first calibrate the watch. Take your iPhone with you and go for a walk of at least 20 minutes by launching the Workout app. 
If you take your iPhone with you, the watch uses its GPS signal to extend its battery life. For the most accurate location using GPS navigation, hold your iPhone in your hand or attach it to a wristband or belt. For GPS on Apple Watch Series 1 or earlier, bring your iPhone. Apple Watch Series 1 and earlier let you track the pace and distance of your workout without an iPhone using the watch's built-in accelerometer. To improve the accuracy of these measurements, you must first calibrate the watch. Go for an outdoor run of at least 20 minutes by launching the Workout app and bringing your iPhone with you. 
Learn more about Power Saving Mode. 
Calorie tracking is done using the built-in accelerometer, even if the heart rate is unknown. If you can't get a stable heart rate during high-intensity interval training (HIIT), you can connect your Apple Watch to a Bluetooth-enabled chest strap. 
The speed can be changed during any workout. Selecting one option for workouts close to walking and the other option for workouts close to running allows you to track your workouts in the Activity app. 
