Step-Up Form Check
Is your step-up actually good? Prop your phone up and find out — GoodReps watches your knee angle (hip → knee → ankle) live and scores every rep as you train your quads and glutes, with hamstrings and calves assisting. Free, in your browser, processed entirely on your device.
▶ Check My Form FreeHOW TO DO A PROPER STEP-UP
Setup Stand facing a sturdy step/box, side-on to the camera.
- Plant one foot on the box and drive through that heel to step up.
- Stand tall at the top.
- Step back down under control; alternate legs.
This is the same instruction sheet you’ll find on the ⓘ panel inside the app — with an animated demo next to it.
THREE STEPS TO A SCORED STEP-UP
Prop your phone and get in frame
Set your phone at roughly torso height and set up side-on to the camera. The built-in camera test confirms your lighting, distance, and angle with live green checks before you start.
The AI locks a 17-point skeleton on you
GoodReps measures your knee angle (hip → knee → ankle) in real time, entirely on your device. No wearables, no sensors. A sturdy step, box, or bench around knee height.
Move — and watch the form bar
The bar fills as you travel from ~170° toward ~100° at the bottom. Stop short and it tells you; a rep only counts through the full range of motion.
WHAT THE CAMERA WATCHES
- Your knee angle, live — from roughly 170° standing through 100° as you load the step. Toe-taps don't bank; real step-ups do.
- Your personal range of motion — after 3 clean reps the counter calibrates to your box height and build.
- Where the power comes from — cheat with the bottom leg and the form cue calls it: "Drive through heel."
COMMON STEP-UP MISTAKES
Bouncing off the back leg
The stealthiest cheat in the gym. The top leg does the work — the bottom foot should leave the floor quietly, not spring off it.
Box too tall, too soon
If you have to lurch to get up, the box is writing checks your quads can't cash. Knee-height or slightly below is plenty.
Knee diving inward
One leg means less room for error. Keep the knee tracking over the mid-foot the whole way up.
Slamming down the descent
Step down under control — the slow lower is half the leg-building.
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
What can I use as a step at home?
Stairs, a sturdy bench, or a plyo box — anything stable around knee height. Make sure it can't slide or tip before you start.
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.