Does Apple Watch Track Weightlifting? What It Logs, What It Misses and What to Do

Published October 10, 2026

Collage of a man doing a standing dumbbell curl with a smartwatch on his wrist, with the headline "Smartwatch Lift Tracking"

Partly. Apple Watch can record a strength session, but only as a summary: the Traditional Strength Training and Functional Strength Training types log how long you trained, your heart rate and an estimated calorie burn. Apple's own guides describe no exercise names, sets, reps or weights, so the watch cannot tell you whether your bench press went up.

This article is general education, not medical advice. Wrist heart rate and calorie numbers cannot diagnose or rule out a health problem. If you have a heart condition, take heart medication, or are returning from an illness or injury, check with a doctor or another qualified professional before relying on them.

What the Workout app records during a lifting session

The Workout app lists both strength types by name. Apple's developer documentation for the underlying workout types describes Traditional Strength Training as strength work that mostly uses machines or free weights, and Functional Strength Training as work with free weights and body weight. Apple's consumer guides do not spell out any difference in what the two record, so treat the choice as a label. Pick the one that matches most of your sessions and stay with it, so your history stays comparable.

Apple's guide to starting a workout says that raising your wrist during a session shows stats such as elapsed time, calories burned and heart rate. When you end the session, the guide says you turn the Digital Crown to rate your effort and then see a summary. Of the stats the guide lists, the ones that apply to lifting are elapsed time, calories burned and heart rate. None of them is an exercise, a set, a rep or a weight.

Nothing in those guides mentions recognizing exercises or counting reps in strength workouts. As of early October 2026, the watchOS 27 page on Apple's site lists Workout updates such as Workout Buddy insights and better treadmill distance, but no set-level strength logging. Coverage of the September 9 hardware announcement (9to5Mac) centered on a new heart rate sensor system and a Readiness score rather than a lifting log. How Readiness should change your training is a separate question, covered in our post on the Apple Watch Readiness score.

What it does not record, and why that matters

Strength progress usually shows up in one of three ways: more load, more reps at the same load, or the same work done with less effort. The watch records none of them. It has no field for which exercise you did, how many sets you finished, how many reps you got or what was on the bar.

Here is a made-up but typical example. In week one you train for 55 minutes with an average heart rate of 112 bpm and a calorie estimate near 300. Bench press goes 80 kg for 8, 8 and 7. A month later you train for 55 minutes, average heart rate 111 bpm, calories near 300. Bench press goes 85 kg for 8, 8 and 8. To the watch, those are the same session. In a log, the second one is a 5 kg jump and a better last set, which is the thing you trained for.

The same gap makes problems hard to diagnose. When a lift stalls, you need to see what you did on the last six sessions, and heart rate cannot show that. Our posts on why tracking workouts leads to better results and how to log your PRs cover what a useful record contains, and diagnosing a plateau from your training log shows what you do with it.

How accurate is wrist heart rate during lifts?

Lifting is an awkward job for an optical sensor on the wrist. You grip, flex and brace, and the movement is irregular. Apple's accuracy guidance says rhythmic movements such as running or cycling give better results than irregular ones such as tennis or boxing, recommends a snug fit on top of the wrist (tighter for workouts than for all-day wear), and notes that you can pair a Bluetooth chest strap if readings are inconsistent.

What lab studies found

In a study of 29 people aged 19 to 37, 16 of them women (Støve and Hansen, Journal of Sports Sciences, 2022), participants did five resistance exercises while wearing an Apple Watch Series 6 and a Polar H10 chest strap. Agreement was high for the barbell back squat, the barbell deadlift and the seated cable row. It was moderate to low for a dumbbell curl to overhead press and for burpees. The authors concluded the Series 6 was suitable for monitoring heart rate during resistance exercise, with results varying by exercise.

A 2026 study (Lee et al., Sensors) tested an Apple Watch Series 7 against ECG in 62 healthy men. They did two sets each of bench press, squat, T-bar row and deadlift at a 10-rep-max load, over about 34 minutes. The Apple Watch's average bias was about half a beat per minute, with 95% limits of agreement of roughly -7 to +6 bpm, and it was the only one of four brands with no significant difference from ECG during the lifting block. The limits matter as much as the headline. The sample was young, healthy men only, the strap tightness was standardized, and heart rate was compared at three time points (before, right after and one minute after the exercise) rather than as a continuous trace.

Apple's own 2026 study

In September 2026 Apple published a heart rate accuracy paper for Apple Watch Series 12 and its new Health Sensing System. It enrolled 1,460 people, 1,254 of whom contributed data to the final analysis, and used a Polar H10 chest strap as the reference. Strength training sessions ran 15 to 20 minutes, and Apple itself lists loaded forearm grip as one of the conditions that makes optical sensing hard. Apple reports lower error for its watch than for the other wrist devices it tested in strength training. Treat that as a manufacturer's claim: Apple authored and published the study on its own site, and in the pages that show the strength results, it gives differences between devices rather than an absolute error in bpm for lifting.

What this means in practice

Wrist heart rate on a recent Apple Watch is probably good enough for rough use during lifting, and it compared favorably with other wrist devices in the studies above, but it is not precise. If individual readings can be off by 6 or 7 bpm even in the Lee et al. study, differences of 2 or 3 bpm between two sessions are within the noise. Sensible uses are confirming that a session happened and how long it ran, getting a general sense of how hard a circuit felt, and comparing like with like, such as the same workout at the same time of day, over several weeks. Heart rate also climbs during sets and falls between them, so a session average blends work and rest. If you follow zones on cardio days, our beginner's guide to heart rate zones explains how, and a chest strap is the better tool when the numbers matter.

Calories: treat them as a rough guess

Apple says the watch uses your height, weight, gender and age to calculate calories, which makes the figure a model's estimate, not a measurement. The research is blunt about how well that works. A 2020 systematic review of 158 publications (Fuller et al., JMIR mHealth and uHealth) found that no brand of wearable was within 3% on energy expenditure more than 13% of the time, and Apple devices overestimated in 18 of 31 comparisons. That review covered studies published through May 2019, so it reflects older models and is not a lifting verdict.

The lifting-specific data point is the Lee et al. study above. For its 34-minute protocol, the Apple Watch's session calorie figure differed from gas-analyzer measurements by about 158 kcal, and the correlation between the two was weak (r = 0.34). The paper's table shows the watch reading about 299 kcal against roughly 141 kcal measured in the lab, which is more than double, even though the authors' text describes the error as an underestimate. The direction is unclear from the paper. The size of the miss is the useful part.

If you are managing body weight, do not add the watch's calories to your food budget. Your weight trend over several weeks is better feedback, and our calorie deficit guide shows how to set a target from that.

A setup that works: watch for heart rate, a log for sets

Plan around what exists today. Reports from Cult of Mac and 9to5Mac, based on code found in watchOS 27 betas, suggest a future Workout app might store sets with weight, reps, equipment and duration. Cult of Mac said the feature was not functional in the builds examined, and Apple has not announced it.

Choose one log for the lifting data. Any log that records exercise, weight and reps for each set will do. Add a few words about effort next to hard sets, for example "about 2 reps left." Our post on RPE and RIR explains the idea.
Let the watch provide heart rate and duration. Start one workout for the session, and decide which app you will treat as the main record of it.
Fit it properly. Wear it snug on top of the wrist, tighten the band for the session, and keep your height, weight and age current in Health Details.
Add a chest strap if heart rate matters. This applies if you are following zones or a clinician gave you a target.
Keep the lines short. One example: "Bench press: 80 kg x 8, 8, 7. Last set grindy." Add the watch's duration or average heart rate only if you will actually use it.

Who should be careful with heart rate numbers

This section applies to everyone, but especially to anyone with a medical condition.

Symptoms outrank numbers. Chest pain or pressure, fainting or near-fainting, unusual shortness of breath, or a racing or irregular heartbeat that does not settle are reasons to stop and get medical help. A watch reading, high or low, does not change that.
Heart medication changes the picture. Some drugs, including beta blockers, change how heart rate responds to effort, so generic zone numbers may not fit you. Apple excluded people taking beta blockers from its own accuracy study. Ask your prescriber what, if any, heart rate guidance applies.
Known heart disease or high blood pressure. Ask your clinician before heavy lifting, and ask what they want you to monitor. A watch is not a substitute for that conversation.
Calorie numbers can be a trigger. If you have a history of disordered eating, seeing a calorie estimate after every session can do harm. Talk with a qualified professional about whether to look at it.

A clinician, not a wrist sensor, decides what a heart rate means for you. Do not use workout heart rate readings to diagnose an arrhythmia or to decide whether a symptom is safe to ignore.

Common mistakes

Treating heart rate or calories as a progress marker. A harder session does not mean a higher number, and a higher number does not mean a harder session.
Comparing heart rate across different exercises. Støve and Hansen found accuracy differed by lift, with a dumbbell curl to overhead press faring worse than squats, deadlifts and rows.
Switching between Traditional and Functional at random. It splits your history for no gain.
Wearing the band loose. A loose fit is the easiest accuracy problem to fix.
Eating back the watch's calories. The estimate can be off by a large margin, and the error may be bigger than the deficit you are aiming for.
Waiting for the watch to become your log. If set-level tracking ever ships, you will still want months of history from before then.

Where Easy Reps fits

Easy Reps is a free gym log for iPhone and Apple Watch that covers the part the Workout app leaves out: exercises, sets, reps and weight. From the watch you can start and finish a workout, edit weight and reps, and see live heart rate. The log syncs through iCloud with no account, and logging works without signal and syncs later. Live heart rate is only as good as the sensor behind it, so the accuracy notes above still apply. Details are on the Apple Watch workout tracker page.

Bottom line

Apple Watch tracks that you lifted, for how long and at roughly what heart rate, and it estimates calories with a wide margin of error. It does not track what you lifted. Use the watch for heart rate and duration, keep a separate log for exercises, sets, reps and weight, and judge your progress by the log. If you have a heart condition or take heart medication, ask your clinician how to use any of these numbers.