Gait analysis for running shops, coaches and physios
A one-page gait report from a phone on a treadmill.
Film a runner on the treadmill for 30 seconds from the side and 30 from behind. tiag reads the video on the phone and gives you a one-page report in under two minutes — cadence, how the foot lands, the hips and the knees — with your shop's name and logo on it, for the runner to take home.
Why
Most gait analysis in a shop is done by eye, or with a video setup that costs more than most shops want to spend. Either way the runner usually leaves with nothing written down — no numbers, nothing to compare next time, nothing to show a coach or a physio.
What it measures
How the foot lands
- Cadence — steps per minute, from the ankles' back-and-forth.
- Knee bend at foot contact — hip, knee and ankle as the foot lands.
- Ankle ahead of hip — how far in front of the body the foot lands.
- Hip extension at toe-off — shoulder, hip and knee as the foot pushes off.
What the hips and knees do
- Pelvic drop — how far the hip on the other side drops while each foot carries the weight.
- Knee crossover — whether the stance knee reaches the middle of the body.
- Left and right side by side.
An overstride is flagged when the ankle lands well ahead of the hip on a nearly straight knee (0.35 leg lengths or more, and 15° of knee bend or less). Every threshold and where it comes from is on How it works.
In the shop
Before and after
Film again in a different shoe, or after a cue like "quicker, shorter steps", and put the two sessions side by side. Every measure is shown before, after and the change — whether the change is an improvement is your call and the runner's, so tiag does not say.
What it is not
tiag gives estimates, not a medical assessment. Angles measured in a flat picture only approximate the body's movement in three dimensions, and they move with where the camera is. Nothing below the ankle is measured, so it says nothing about heel or forefoot strike or the arch. Flags mean "worth a look with a coach or physio", and every report says so.
Video stays on the phone
The pose model runs in the browser on the device that filmed. The video is never uploaded: what is saved is the measurements and twelve body points a frame (shoulders, elbows, wrists, hips, knees, ankles — no face), so the take can be read again when the engine improves.
The shop pilot
We are looking for running shops, run coaches and sports physios who already offer gait analysis to use tiag with real customers and tell us plainly what works and what does not.