Turn your phone into a
running lab.
Upload a clip and see the same stride mechanics a gait lab looks at. Cadence, overstride, trunk lean, and more, with drills to work on. Built for every runner, first 5K to sub-elite.
Runs in your browser · No account needed · Your video never leaves your device
Raw footage · Same stride, screened
How it works
Phone → Upload → Answers
Film from the side
Square to the runner, camera level, whole body in frame. A treadmill is perfect. Slow-mo (120fps+) sharpens the detail.
10 seconds to set up
Pick your mode & upload
Distance/XC or sprint, then upload straight from your camera roll. Everything runs in your browser.
Your video stays on your device
Get your stride report
Cadence, overstride, trunk lean, bounce, symmetry, each flagged and explained, with drills to work on.
Results in under 30 seconds
Train. Re-screen. Repeat.
Work the drills, film again, and compare. The more you screen, the clearer your progress gets.
A snapshot becomes a trend
No account needed · Runs in your browser
Why Run Lab
Your stride is talking.
Here's what it's saying.
See what the eye misses
Frame-by-frame pose tracking measures the stride patterns research ties to efficiency and durability, the same ones a gait lab checks.
Drills, not just flags
Every pattern comes with specific drills and cues, from cadence work to single-leg strength, so you know exactly what to do next.
Distance and sprint
Two modes tuned to the event. Cadence, overstride and bounce for distance; knee lift, hip drive and front-side mechanics for sprint.
Honest about the science
Cadence is pace-dependent and 180 is a myth. We read your numbers against your pace and tell you where 2D video can and can't measure.
Your stride report
Everything you need
to train with purpose.
Stride summary
Cadence, steps read, trunk lean, and symmetry at a glance
Flagged patterns
Plain-English explanations, read against the pace you filmed
Drills to work on
Cadence work, mobility, and single-leg strength, tailored to what we find
Coaching cues
Land under your hips. Run tall. Language you can use on your next run
Research-backed
Grounded in published gait science, with the debated parts flagged
Re-screen anytime
Film again after training and compare. See the change
Free, and your video never leaves your device.
Gait Screening Report
Distance / XC · 14 strides read
Cadence
174
spm
Trunk lean
8°
fwd
Symmetry
4%
L/R
Overstride · Work on
Shin reaching out ahead of the body at contact
Knee bend at contact · Monitor
Landing a touch stiff-legged, less shock absorption
Trunk lean · Clear
Balanced forward lean, in a strong range
Drills to try
A single screening tells you where you are.
Re-screening tells you where you're going.
Mechanics shift with fitness, fatigue, and the work you put in. Film again after a training block and compare. The kind of gait tracking that used to mean a trip to a lab, now from your phone, on your schedule.
Built on the research,
honest about the limits
Run Lab runs on the same computer-vision engine behind CritchPitch's pitching screening, retuned for running gait. The thresholds and cues come from published work on running mechanics, Heiderscheit on cadence, Bramah on injury-associated patterns, Teng & Powers on trunk lean, and more.
It is a movement screening, not a diagnosis. A single 2D clip can't measure force or true 3D rotation, so where a number is a screening estimate, we say so.
33
Landmarks
2D
Any phone
On-device
Private
Cited
Research
Your stride is
already talking.
Upload a clip. Get your stride report.
No account, no commitment.