Mountain Climber Form Check
Is your mountain climber 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 core and shoulders, with quads assisting. Free, in your browser, processed entirely on your device.
▶ Check My Form FreeHOW TO DO A PROPER MOUNTAIN CLIMBER
Setup Start in a high plank, side-on to the camera.
- Drive one knee toward your chest, then switch quickly.
- Keep your hips low and your core braced.
- Alternate at a steady, controlled pace.
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 MOUNTAIN CLIMBER
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. No equipment — a high plank and some floor space.
Move — and watch the form bar
The bar fills as you travel from ~155° toward ~65° 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 drive, live — the hip-knee angle closing from roughly 155° in the plank toward 65° at the chest. Little shuffles don't bank; real drives do.
- Your personal range of motion — after 3 clean reps the counter calibrates to your stride, so it stays honest at speed.
- Each knee actually arriving — go short and the form cue keeps you honest: "Drive knee to chest."
COMMON MOUNTAIN CLIMBER MISTAKES
Hips piking to the ceiling
Rising hips make the knee drive easier and the exercise weaker. Hold the plank line — shoulders over wrists, hips level.
Short, tappy steps
If your feet barely move, you're jogging in place at an angle. Drive each knee all the way toward your chest — that's the rep.
Shoulders drifting behind wrists
Sitting back unloads your core. Keep your shoulders stacked over your hands the entire time.
Trading form for speed
Fast is the point — but only after the movement is clean. Earn the speed with full-range drives first.
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 for mountain climbers?
No — a patch of floor and your phone propped side-on. Grippy shoes or bare feet help on smooth floors.
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.