Sit-up counter
Lie down, put your phone on the floor beside you and go. This free sit-up counter counts every full sit-up out loud, so you can keep your eyes on the ceiling instead of a screen, and tells you when a rep doesn’t come all the way up.
Count your sit-upsFree · no app, no sign-up · your video stays on your device
How to use it
- Open the coach and press Start training. Allow the camera when your browser asks.
- Put your phone on the floor about 2 metres to your side, in landscape, so your head and feet are both in the frame.
- Lie on your back with your knees bent and your feet flat, and hold still for a second.
- Sit up. The coach recognises sit-ups on your first rep, which already counts, and calls out every rep after it. Press Finish set when you’re done.
What counts as a sit-up
The coach measures the angle between your back and the floor. A sit-up counts when you come up from lying flat to sitting nearly upright, with your chest close to your knees, and then lower back down.
- Not sitting up: stop halfway and the rep doesn’t count. The coach says so, so you can come all the way up on the next one.
- Not quite upright: the rep counts, but it’s flagged. Finish each sit-up sitting tall.
- Dropping back down: falling back to the floor is flagged too. Roll down slowly: your abs work on the way down as well.
Sit-ups or crunches?
A crunch only lifts your shoulder blades off the floor; a sit-up comes all the way up to sitting. The coach recognises both and counts each to its own standard, so you can do a set of crunches straight after your sit-ups.
Tips for an accurate count
- Side-on, on the floor. From the side, the counter can see how far you come up.
- Head to feet in view. Landscape helps you fit in the frame.
- Hook your feet under something sturdy, like a sofa, if they lift. A partner holding your feet can confuse the tracking, because the counter follows one person.
- Hands on your chest, or lightly by your ears. Don’t pull on your neck to get up.
How many sit-ups should you do?
Start with 2 or 3 sets of as many good sit-ups as you can, and add a couple each week. Sit-ups train your abs and hip flexors; for a stronger core all round, mix them with planks and leg raises.
What the coach checks
- Not sitting up. Sit all the way up until your chest is close to your knees.
- Not quite upright. Finish each sit-up sitting tall.
- Dropping back down. Roll back down slowly instead of falling back — your abs work on the way down too.
Read the sit-up form guide for the technique, step by step.
Questions and answers
Does it count half sit-ups?
No. A rep counts when you sit up nearly upright. Stop halfway and the coach tells you it didn't count.
Can I use it for a one-minute sit-up test?
It counts your sit-ups but doesn't time a minute for you. Start a timer on another device or watch a clock, and press Finish set when the time is up.
Why aren’t my sit-ups being counted?
Check that the phone is on the floor to your side, in landscape, with your head and feet both in view. Facing the camera, it is hard to see how far you sit up.
Is my video uploaded?
No. The tracking runs on your device: your video is never uploaded, recorded or stored, and you don't need an account.
Ready? Prop up your phone.
It's the same free AI coach for every exercise: it recognises what you're doing, counts out loud and tells you when your form slips.
Count your sit-upsFree · no app, no sign-up · your video stays on your device