You laced up, started a workout on your Apple Watch Series 10, and finished only to find no distance logged, a blank heart rate graph, or a session that never recorded at all. It is a frustrating moment, especially when this watch carries the sensors built specifically for tracking effort. The Series 10 has built-in GPS (L1 GPS, GLONASS, Galileo, QZSS, BeiDou), a third-generation optical heart sensor, an electrical heart sensor, a high-g accelerometer, a high dynamic range gyroscope, an always-on altimeter, and a compass, so the hardware to follow your run, ride, or gym session is all there.
That means a workout that will not track is almost always a fit, setting, or software hiccup rather than a broken watch. The fixes below move from the quickest, safest checks to the official reset and support paths, so start at the top and work down only as far as you need to. Most people get their numbers back well before the last step.
Start With How the Watch Sits on Your Wrist
Workout tracking leans heavily on the sensors pressed against the back of the watch, and they need clean, consistent skin contact to read you correctly. According to the official support guidance, you should make sure your Apple Watch fits snugly on top of your wrist so the heart rate sensor stays close to your skin. A band that slides around during movement is one of the most common reasons readings drop out mid-session.
The suggested habit is simple. Tighten your Apple Watch band for workouts, then loosen it again when you are done. The fit should be secure without being uncomfortable, and the watch should stay put rather than shift with every stride.
Cleanliness matters just as much. Make sure your wrist and your Apple Watch are clean and dry, because water and sweat can cause a poor recording. Wipe any buildup of lotion or sunscreen off the back crystal, since residue there can impact sensor functionality and quietly sabotage your data.
Confirm Wrist Detection Is Switched On
Wrist Detection tells the watch it is actually being worn, and when it is off, background heart rate readings will not be taken. If your workouts log distance but show gaps in heart rate data, this toggle is worth checking first.
On your iPhone, open the Watch app, tap the My Watch tab, tap Passcode, then make sure Wrist Detection is on. With it enabled, the watch resumes the background readings that feed into a complete workout record.
Make Sure Heart Rate Monitoring Is Enabled
If the heart rate feature was ever turned off, your sessions will record without the pulse data they depend on. Re-enabling it is quick and happens right on the watch.
On the watch, go to the Settings app, tap Privacy & Security, tap Health, tap Heart Rate, then turn on Heart Rate. Remember that the back of the watch needs skin contact for the heart rate sensor to work, so this step pairs naturally with the snug-fit check above.
Turn On Detect Gym Equipment for Indoor Machines
If your treadmill, elliptical, or other indoor cardio machine sessions are the ones failing to track, the issue may be a single setting rather than the sensors. The Series 10 can connect to compatible gym equipment, but only when the right option is active.
To confirm it, go to the Settings app on your Apple Watch, tap Workout, then turn on Detect Gym Equipment. With that enabled, the watch is ready to pair with supported machines for more accurate indoor metrics.
Switch On Motion Calibration and Then Recalibrate
For outdoor walks and runs, the watch blends GPS with motion data to estimate distance and pace, and that motion piece relies on a system setting on your iPhone. If it is off, your accuracy can suffer even when GPS is working fine.
On your iPhone, open the Settings app, tap Privacy & Security, tap Location Services, tap System Services, and make sure Motion Calibration & Distance is turned on. This gives the watch the movement data it needs to translate your stride into real numbers.
Once that is confirmed, give the watch a chance to learn your gait. Wearing the watch, go to a flat, open outdoor area with good GPS, open the Workout app, tap Outdoor Walk or Outdoor Run, and walk or run at your normal pace for about 20 minutes. This calibration session sharpens distance and pace for future workouts.
Restart the Watch to Clear a Glitch
When the right settings are in place but workouts still misbehave, a restart clears temporary software hiccups without touching any of your data. It is the safest reset available and often enough on its own.
- 1.Press and hold the side button until the sliders appear.
- 2.Tap the Power Button.
- 3.Drag the Power Off slider to the right to turn the watch off.
- 4.To turn it back on, hold the side button until the Apple logo appears.
One detail to keep in mind. The watch cannot restart while charging, so take it off the charger before you begin.
Force Restart If the Watch Is Frozen
If a normal restart does not help, or the watch is frozen and unresponsive, a forced restart is the next step. Use this only after the standard restart fails, since it is a harder reset for a stuck device.
Hold down the side button and the Digital Crown at the same time for at least 10 seconds, until the Apple logo appears. Once the logo shows, you can release both buttons and let the watch boot normally.
Update watchOS to the Latest Version
Bugs that affect workout tracking are often fixed in software updates, so making sure your Series 10 is current can resolve issues that no setting change will. You can update from your iPhone or directly on the watch, whichever is more convenient.
From your iPhone, open the Apple Watch app, tap the My Watch tab, tap General, then tap Software Update. On the watch itself, connect to Wi-Fi, then go to the Settings app, tap General, tap Software Update, and tap Install if an update is available.
For the update to complete cleanly, keep the watch at least 50% charged and on its charger, with your iPhone connected to Wi-Fi, while it installs. Updating to watchOS 26 specifically requires an iPhone 11 or later, or an iPhone SE 3rd generation or later, running iOS 26.
Reset Fitness Calibration Data
If distance, pace, or calories are consistently off rather than missing entirely, the watch may be working from stale calibration. Resetting that data clears the learned profile so the watch can build a fresh, accurate one.
On your iPhone, open the Watch app, tap the My Watch tab, tap Privacy, then tap Reset Fitness Calibration Data. After resetting, recalibrate by repeating the 20-minute outdoor walk or run described earlier so the watch relearns your pace and stride.
Unpair and Re-Pair as a Last Resort
If nothing above restores reliable tracking, unpairing and re-pairing gives the watch a clean slate. Be aware that unpairing erases everything on the watch and restores its factory settings. Your iPhone keeps a backup, though, so you can restore your data after you set the watch up again.
- 1.On your iPhone, open the Apple Watch app.
- 2.Tap the My Watch tab.
- 3.Tap All Watches.
- 4.Tap the info button next to your watch.
- 5.Tap Unpair Apple Watch.
- 6.Enter your Apple Account password to disable Activation Lock.
After it unpairs, set the watch up again and restore from the backup when asked. As a last-resort alternative, you can erase directly on the watch by going to the Settings app, tapping General, tapping Reset, then tapping Erase All Content and Settings and entering your passcode. On cellular models you will choose to keep or remove the cellular plan. Erasing this way also removes all content and settings, so re-pair afterward and restore from a backup when prompted. If your workouts still will not track after re-pairing, contact Apple Support for further help.
Frequently Asked Questions
Does the Apple Watch Series 10 have the sensors needed to track workouts?
Yes. The Series 10 includes built-in GPS (L1 GPS, GLONASS, Galileo, QZSS, BeiDou), a third-generation optical heart sensor, an electrical heart sensor, a high-g accelerometer, a high dynamic range gyroscope, an always-on altimeter, and a compass. The Workout app can use the accelerometer, the heart rate sensor, and GPS, so tracking is a supported capability on this model.
Why is my heart rate not showing up during workouts?
Heart rate readings depend on skin contact, so first make sure the watch fits snugly and your wrist and the back crystal are clean and dry. Then confirm Wrist Detection is on (Watch app, My Watch tab, Passcode) and that Heart Rate is enabled on the watch under Settings, Privacy & Security, Health, Heart Rate.
How do I fix inaccurate distance or pace on outdoor runs?
Make sure Motion Calibration & Distance is turned on in the iPhone Settings under Privacy & Security, Location Services, System Services. If readings are still off, reset your calibration in the Watch app under My Watch, Privacy, Reset Fitness Calibration Data, then recalibrate with a 20-minute outdoor walk or run in an open area with good GPS.
Will unpairing my Apple Watch delete my workout history?
Unpairing erases the watch and restores factory settings, but your iPhone keeps a backup. When you re-pair the watch, you can restore from that backup so your information is brought back during setup.
Which iPhone do I need to update my Series 10 to watchOS 26?
Updating to watchOS 26 requires an iPhone 11 or later, or an iPhone SE 3rd generation or later, running iOS 26. Keep the watch at least 50% charged and on its charger, with the iPhone on Wi-Fi, while the update installs.
