Crunch Rep Counter
Skip the mental math. Point your phone at yourself and every full-range crunch counts itself — sets, reps, and PRs logged while you train your core. Free in your browser today; coming to Google Play and the App Store.
Coming to Google Play & the App Store▶ Try The Rep Counter
LIVEHOW TO DO A PROPER CRUNCH
Setup Lie on your back, side-on to the camera, knees bent, hands by your head.
- Curl your shoulders up off the floor toward your knees.
- Squeeze your abs at the top.
- Lower with control — don't yank your neck.
Same sheet as the ⓘ panel in the app — animated demo included.
HANDS-FREE IN THREE STEPS
Prop your phone and get in frame
Phone at roughly torso height, set up side-on to the camera. A quick camera test checks lighting, distance, and angle before you start.
The camera locks a 17-point skeleton on you
GOODREPS measures your hip angle (shoulder → hip → knee) on-device — no wearables, no clickers. No equipment — floor space and your phone propped side-on.
Just work — the counter does the counting
A rep banks at the bottom (~120°) and re-arms near ~160°. Half reps don’t count; after 3 clean reps it calibrates to your range.
WHAT MAKES A REP COUNT
- Your torso angle, live — from roughly 160° lying flat up toward 120° at the crunch. Neck-bobs don't bank; real trunk flexion does.
- Your personal range of motion — after 3 clean reps the counter calibrates to how you move.
- Whether the crunch actually happens — pulse too small and the form cue insists: "Crunch fully."
COMMON CRUNCH MISTAKES
Pulling on your neck
Hands yanking your head forward strain your neck and skip your abs. Fingertips behind your ears at most — the crunch starts at your ribs.
Sitting all the way up
A crunch lifts your shoulder blades, not your whole back. Coming fully upright shifts the work to your hip flexors.
Dropping back down
The lowering half is half the exercise. Come down slow enough that your abs — not gravity — control the descent.
Holding your breath
Exhale as you crunch up; it lets your abs contract fully. Inhale on the way down and keep a rhythm.
PRIVATE BY DESIGN
Pose detection runs in your browser via TensorFlow.js. Camera frames are analyzed in real time and immediately discarded — nothing is recorded, nothing leaves your phone, and we never see them. Sign-in is optional; skip it and everything stays local.
QUESTIONS, ANSWERED
Do I need any equipment to count crunches?
No — just floor space (a mat is more comfortable) and your phone propped side-on so the camera can see your torso fold.
Does it work in a home gym or low light?
Run the built-in camera test first — it checks your lighting, distance, and angle with live green checks before you start. If a rep still slips through, manual counting is always one tap away.
Is my camera feed uploaded anywhere?
No. Pose detection runs entirely on your phone, in your browser. Frames are analyzed in real time and immediately discarded — nothing is recorded, nothing is uploaded.
RELATED GUIDES
Free forever — camera counting for all 60 exercises, no account needed. Pro (voice coaching, programs, depth-camera form checks) is $7/mo, $49/yr, or $99 once. No ads, ever.