Plank Alignment Check
Wondering if your plank is aligned? Prop up your phone — GOODREPS watches your hip angle (shoulder → hip → ankle) live and times the hold only while your form is right, as you work your core, with shoulders assisting. Free in your browser today; coming to Google Play and the App Store.
Coming to Google Play & the App Store▶ Try The Alignment Check
LIVEHOW TO HOLD A PROPER PLANK
Setup Forearms and toes down, side-on to the camera.
- Hold a straight line from head to heels.
- Squeeze your glutes and brace your core.
- Don't let your hips sag or pike up.
Same sheet as the ⓘ panel in the app — animated demo included.
THREE STEPS TO A SCORED HOLD
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 → ankle) against the pose target (~155°) on-device — no wearables. A mat helps. Forearms or hands — pick the variation the app shows.
Settle in — the timer only counts real alignment
The hold timer runs while you’re in the pose. Drift out and it pauses (doesn’t reset) until you find the shape again.
WHAT THE CAMERA WATCHES
- A straight line from shoulders through hips to heels.
- The hold timer — pauses if hips pike or sag out of the window.
- Elbows under shoulders (forearm plank) — stacked joints, not reaching.
COMMON PLANK MISTAKES
Hips sagging
A soft midsection dumps stress into the low back. Squeeze glutes and ribs down.
Hips piking up
That is a down-dog cousin, not a plank. Push the heels back and level the hips.
Holding your breath
Steady breathing keeps the brace honest across a long hold.
Shrugging into your ears
Push the floor away and slide the shoulder blades down the back.
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 gear for plank?
Usually just floor space (and whatever the hold requires — bar, wall, or bench). Your phone camera does the coaching.
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.