How do you track strength training on Apple Watch?

Open the Workout app, choose Traditional Strength Training for barbells, dumbbells and machines (Functional Strength Training for bodyweight and free-weight circuits), start it before your first set and end it after your last. The watch records the time, your heart rate and an estimate of the calories, and saves them to Apple Health and the Fitness app. It doesn’t record your exercises, sets, reps or weights: for those you need a lifting app.

Log a lifting session with the Workout app

1. Open Workout on the watch and turn the Digital Crown to Traditional Strength Training. If it isn’t there, scroll to the bottom of the list and tap the add button to find it.
2. Tap start (or the middle of the screen) as you begin your warm-up.
3. Lift. Don’t pause between sets: the rests are part of the session, and your heart rate is still up during them. For a real break, press the side button and the Digital Crown together to pause.
4. When you’re done, swipe right, tap End and look over the summary.

Traditional or Functional?

Apple’s developer documentation describes the traditional type as strength training “primarily using machines or free weights”, and the functional type as training “primarily with free weights and body weight”. Pick Traditional for a gym session of barbells, dumbbells and machines, and Functional for circuits, kettlebells and bodyweight work. Apple doesn’t say how the two types differ in the way they estimate calories, so choose by what you do and keep to it, so your sessions stay comparable.

What the watch measures, and what it doesn’t

What it records:

• Heart rate, through the whole session. It’s the watch’s strong point: in a 2026 study of 62 men, the Apple Watch’s heart rate during resistance exercise agreed with an ECG to within about 7 beats per minute, and averaged within half a beat (Lee et al. 2026). It’s least accurate in the seconds right after a set (Yun et al. 2026).
• Active calories, estimated from your heart rate, your movement and the details in your Health profile (age, sex, height and weight).
• The time, with a summary.

What it doesn’t:

• Your exercises, sets, reps and weights. Apple’s watchOS 27 guide describes no way to log them in the Workout app, and the watch can’t see what’s on the bar.
• Accurate lifting calories. In the same study, the watch’s energy for resistance exercise was about twice what indirect calorimetry measured (299 against 141 kcal), and a second 2026 study, with the watch set to Traditional Strength Training, found the same (296 against 140 kcal, Yun et al. 2026). Treat it as a rough trend (why the Apple Watch overestimates lifting calories).

Tips for better readings

• Wear it snug on top of the wrist, above the wrist bone, and tighten the band for workouts, as Apple advises. If the back of the watch leaves your skin when you shake your wrist and turn your palm up, it’s too loose.
• Move it up for heavy grips. Pressing, curling and holding a heavy bar bend the wrist back, which can lift the sensor off the skin or jam the watch against the bar. On lifting days, wear it a finger’s width higher up the forearm.
• Add a chest strap if readings drop out. Apple notes that the sensor reads steady, repetitive motion better than irregular movement, and the watch can pair with a Bluetooth chest strap.
• Keep your details current. The calorie estimate uses your age, sex, height and weight, which you can update in the Watch app on your iPhone under My Watch › Health › Health Details.

Where the workout ends up: Health and Fitness

• In Fitness on the iPhone, tap Sessions in the summary, then the workout, for its time, heart rate and calories. It counts toward your Activity rings.
• In Health, the workout is under Browse › Activity › Workouts, and the watch’s heart rate under Heart.
• If you forgot to start it, log it afterwards in Fitness (from the Workout tab) or in Health (Browse › Activity › Workouts, then add), with its time and calories.

Workouts that a compatible app saves to Health show up in the same places and count toward your Move ring (Apple Support), so a lifting app doesn’t take your workouts out of Fitness.

What a lifting app adds

The watch is a good heart rate monitor and timer. Building muscle needs a training log: which exercise, the weight and reps of every set, how close to failure you went, how long you rested, and what to lift next time. A lifting app keeps that log and can still save the session to Health.

Run one workout on the watch at a time, though. Apple Watch runs a single workout session, so if a lifting app starts one, don’t start the Workout app too.

How Workout Wizard does it

You log the workout on the iPhone: each set’s weight and reps, against the targets the app gives you. When you tap Start workout, Workout Wizard opens on your Apple Watch (if the watch has the app) and starts a strength workout there. The Watch app is read-only, with nothing to tap. It shows:

• The time you’ve trained
• Your heart rate
• Your calories two ways, the app’s estimate from the sets you log and your body next to Apple’s
• The set to do now, with the exercise, the set number, and its weight and reps
• Between sets, a countdown for your rest with the reason for its length, and a tap on your wrist when it’s over (how long to rest between sets)

The watch’s heart rate also feeds the app’s estimate: between sets, the calories follow it, using your age and Health’s resting heart rate and VO2 max. Pause the workout on the iPhone and the watch pauses too.

When you finish, the watch saves the workout to Health as Traditional Strength Training, with its heart rate and Apple’s calories, and the iPhone doesn’t save a second copy. Your sets, reps and weights stay in the app. Stop or discard the workout and nothing is saved.

No watch? Turn on Save workouts to Health in Settings. Each timed workout you finish is then saved as strength training, with its time and the app’s calorie estimate. It’s off by default, so a workout that another app also saves doesn’t count twice.

On the iPhone, a Live Activity keeps the workout on the Lock Screen and in the Dynamic Island: the time, the calories, the set to do with its weight and reps, and the rest countdown. Its check logs that set without opening the app.

Before your next session

Start Traditional Strength Training in the Workout app before your first set, wear the watch snug above the wrist bone, don’t pause between sets, and end the workout after your last. Health and Fitness get the time, your heart rate and a generous calorie estimate, but no sets, reps or weights: log those in a lifting app that saves to Health.

Sources

• Apple Support. Start a workout on Apple Watch (Apple Watch User Guide, watchOS 27). support.apple.com/guide/watch/start-a-workout-apdd16e8761a/watchos
• Apple Support. Workout types on Apple Watch. support.apple.com/en-us/105089
• Apple Developer Documentation. HKWorkoutActivityType: traditionalStrengthTraining and functionalStrengthTraining. developer.apple.com/documentation/healthkit/hkworkoutactivitytype
• Apple Developer Documentation. HKWorkoutSession. developer.apple.com/documentation/healthkit/hkworkoutsession
• Apple Support. Get the most accurate measurements using your Apple Watch. support.apple.com/en-us/105002
• Apple Support. See your activity summary in Fitness on iPhone (iPhone User Guide, iOS 27). support.apple.com/guide/iphone/see-your-activity-summary-iph4c34a8a95/ios
• Apple Support. Log a workout in Fitness on iPhone (iPhone User Guide, iOS 27). support.apple.com/guide/iphone/log-a-workout-iphf16df7c54/ios
• Apple Support. How to manually add a workout in the Health app. support.apple.com/en-us/101952
• Apple Support. Intro to Health data on iPhone. support.apple.com/guide/iphone/intro-to-health-data-iphbb8259c61/ios
• Apple Support. Sync a third-party workout app to Fitness on iPhone. support.apple.com/guide/iphone/sync-a-third-party-workout-app-iph392b962da/ios
• Apple Support. What’s new in watchOS 27. support.apple.com/guide/watch/whats-new-apdb93ea3872/watchos
• Apple Newsroom, 2026-09-09. Apple advances health and fitness capabilities using Apple Intelligence. apple.com/newsroom/2026/09/apple-advances-health-and-fitness-capabilities-using-apple-intelligence/
• Lee T-H et al. 2026. Comparative validity of smartwatch-derived heart rate and energy expenditure during endurance and resistance exercise. Sensors 26(8):2526. doi:10.3390/s26082526. PMID 42076635.
• Yun J-H, Ko J-M, Lee T-H. 2026. Criterion validity of smartwatches for measuring heart rate and energy expenditure during resistance exercise. Bioengineering 13(10):1099. doi:10.3390/bioengineering13101099. PMID 42938956.