Your technique, measured — not guessed
A bike-fit, gait check and stroke analysis from a single phone clip. Motus tracks your body frame by frame, measures the angles a coach would, and tells you exactly what to change — and when it isn't sure.
How the analysis works
Five steps, fully automated, in under a minute.
A 15-30s side-on video on a trainer, treadmill, or from the pool deck. MP4/MOV, up to 50MB.
MediaPipe BlazePose (Heavy model) locates 33 body landmarks in every frame — markerless, no sensors.
We smooth the signal (Butterworth), find the key moments (pedal dead-centres, foot strike, catch) and compute real joint angles.
Each metric is graded against research-backed ranges for your sport and position — with a confidence level for every number.
A coach-style report: what's good, what to fix, by how much, and drills to get there — plus an annotated overlay video.
What we measure, by sport
Each sport has its own model, reference ranges and recommendations.
Cycling — virtual bike-fit
Knee angle at the bottom and top of the pedal stroke, hip and trunk angle, elbow and shoulder, and saddle-height assessment. Detects road, TT and triathlon positions and flags medical risks (e.g. hip angle too closed in aero).
Reference ranges: Retul fit windows, Bini et al. 2011, Burt 'Bike Fit', Fintelman et al. 2015.
Running — gait analysis
Cadence, vertical oscillation, trunk lean, knee drive and ground contact time from the side; pelvic drop, knee valgus and lateral lean from the rear. Targets adapt to your level so beginners aren't graded like elites.
Reference ranges: Novacheck 1998, Heiderscheit 2011, Folland 2017, Bramah 2018.
Swimming — stroke analysis
Stroke rate, streamline, entry angle, recovery elbow and breathing pattern above water; catch/EVF, body line and stroke path underwater. Each metric carries an honest confidence badge — water is hard for any pose model.
Reference ranges: Maglischo 2003, Counsilman, Craig & Pendergast 1979 (coaching consensus).
Why Motus is different
Most tools hand you a number. We show our work — and our doubts.
Every metric shows how trustworthy it is. No false precision dressed up as a clean number.
When tracking is too noisy to be reliable, we say so and hold back the score instead of inventing one.
Film each side and we compare your left and right pedal stroke for asymmetry — strength imbalances, leg-length, cleat issues.
Bike, run and swim — not a single-discipline tool. Built for triathletes.
Reference ranges trace to published sport-science and bike-fit literature, not vibes.
Run real analyses from home at no cost while we build. Your videos stay private.
How to film a good clip
Two minutes of setup gets you the most accurate read.
- Film square-on from the side (90°), camera at hip height.
- 3-5m away with your whole body in frame, even lighting.
- Steady effort: 15-30 seconds at a natural cadence.
- One person in frame, on a trainer / treadmill / by the pool.
What you get
Your clip with the skeleton and live angle arcs drawn on every frame.
Specific, prioritized fixes with amounts and drills — not 'work on your form'.
Know which numbers to trust and which to re-film for.
Re-analyze later and see what improved, worsened, or stayed the same.
Questions
Do I need special equipment?
No. Any modern phone and a side-on view. A trainer (bike) or treadmill (run) keeps you in frame.
Is this as accurate as a professional fit?
It measures the same joint angles a fitter uses, against the same kind of reference ranges, and is honest about its confidence. It won't check cleats or saddle pressure — but it's a research-grade starting point you can repeat any time.
Does it work underwater?
Yes, with a clear caveat: pose tracking is hardest underwater, so submerged catch/elbow metrics carry a lower confidence badge and we never overstate them.
Is my video private?
Yes. Your clips are yours; we don't share them, and you can delete an analysis at any time.
See your technique through the eyes of AI
Upload a clip and get your first analysis in under a minute.
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