Russian Twist Form Check
Wondering if your russian twist is solid? Prop up your phone — GOODREPS watches your shoulder angle (hip → shoulder → shoulder) live and scores every rep while you train your obliques and core. Free in your browser today; coming to Google Play and the App Store.
Coming to Google Play & the App Store▶ Try The Form Check
LIVEHOW TO DO A PROPER RUSSIAN TWIST
Setup Sit with knees bent, leaning back slightly, facing the camera.
- Rotate your torso to one side, then the other.
- Keep your chest up and your core braced.
- Move from your torso, not just your arms.
Same sheet as the ⓘ panel in the app — animated demo included.
THREE STEPS TO A SCORED RUSSIAN TWIST
Prop your phone and get in frame
Phone at roughly torso height, stand facing 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 shoulder angle (hip → shoulder → shoulder) on-device — no wearables. Bodyweight or a light plate/medicine ball at the chest.
Move — and watch the form bar
The bar fills from ~4° toward ~22° at the bottom. Cut range short and it tells you; full ROM is what counts.
WHAT THE CAMERA WATCHES
- Rotation through the ribs while the hips stay grounded.
- A controlled tap each side — not a wild spin.
- Chest up in the hollow/V sit position the app asks for.
COMMON RUSSIAN TWIST MISTAKES
Only moving the arms
Turn the ribcage. Arms hold the weight; the torso does the twist.
Rounding into a sad crunch
Stay long through the spine. Collapse kills the oblique work.
Feet flailing for momentum
Plant heels or keep legs steady per the variation — no thrashing.
Going too fast to count
Own each side. Speed without rotation is just cardio flailing.
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 check my russian twist form?
Just your phone for most variations. Add free weights when the pattern is clean — the app still scores the movement either way.
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.