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Automatic set tracking for lifters, in development for Apple Watch

Do the set.Your watch logs it.Do the next one.

Your watch notices when a set starts and when it ends, names the exercise and counts the reps. All of it runs on the watch, with no phone in your hand, and you confirm each set with one tap. It names a handful of exercises so far. Anything else you log by tapping start and end and picking it from a list.

One email when it ships. Nothing else.

Playback — one recorded session

0reps

Waiting for the first set

Recording

  • Barbell Bench Press · 0/8
  • Barbell Overhead Press · 0/6
  • Dumbbell Biceps Curl · 0/12
  • 50 Hz · 115 s

Counting the reps is the easy half.

Anything can tell you that you did eight. The question that decides whether the set did anything is what happened across those eight — and it is the question nobody can answer, because you cannot write it down while you are the one under the bar.

Barbell Bench Press

Tuesday, 6:12 pm · 8 reps · 60 kg · 32.8 s

Move across the set

Rep 8 range
68%

-29 points vs rep 1

Short at the top
11%

never finished the lockout

Short at the bottom
21%

stopped 79% of the way down

Rep 8 bar speed
0.12m/s

-65% vs rep 1

Across the whole set

Estimated RPE
9

about 1 rep in reserve

Range score
87/100

mean range against your own

Bar speed lost
65%

0.34 down to 0.12 m/s

Tempo
1.8/1.6s

mean lowering / lifting

The working range fell 29 points, and it closed from both ends. Depth went first — 98% down to 79%. Then from rep five the top went too: he stopped finishing the lockout, so the last rep started 11% below where the first one did. The lifting phase doubled over the same reps, from 1.2 s to 2.4 s. A counter sees 8. The last of them covered 70% of the range the first one did — there was one honest rep left in the tank, not three.

How the models work, with the data they were trained on and what they still get wrong.

Then it tells you what to change.

One set is a data point. A block of them is the thing you actually train against — and execution turns before load does, every time.

Barbell Bench Press

Estimated one-rep max · 24 weeks · illustrative

TrackedUntracked
8090100week 9 — range of motion starts falling+14 kg107 kg93 kgWeek 1Week 24
The stall shows up in how the reps move weeks before it shows up on the bar. Range of motion and rep speed were already falling at week 9, while the weight was still going up — which is the window where a stall is still a technique problem and not yet a lost month. This is an illustration of that mechanism rather than a measured outcome: the app does not exist yet, and nobody has trained a block with it.

What it names today, and what it never will.

The watch names a short list of exercises on its own so far. Everything else you log with a tap, and the model learns more of them as lifters who opt in share their recordings. The leg machines are different: your hands rest on a handle that does not move, so there is nothing at the wrist to read. Those are logged by hand and never guessed at. We would rather say so here than have you find out in week three.

5it names on its own, and you confirm with a tap
  • Bodyweight Squat
  • Dumbbell Biceps Curl
  • Dumbbell Lateral Raise
  • Dumbbell Shoulder Press
  • Push-Up

Everything else in the catalogue

Tap to start the set, tap to end it, pick the exercise from your recents or by body part. Weight and reps carry over from your last set.

4you log by hand, and always will
  • Leg Press
  • Leg Extension
  • Seated Leg Curl
  • Calf Raise
A photograph at the resolution a wrist sensor works in. Most of it is gone. What matters is still there.

Get the first build.

The model learns from what the earliest users record. Signing up now shapes it more than signing up later will.

One email when it ships. Nothing else.