Phase by phase, not gut feel
Good sprints technique isn't a vibe. It's a sequence. Each phase has clear targets you can measure: angles, foot positions, body lean. The AI tells you which phase in your rep is costing you the most.
Sprints technique is about precision. Every sprints rep is a chain of phases. Each phase sets up the next. Get the phase-by-phase breakdown coaches use, plus AI that grades your own technique against it, frame by frame.
Good sprints technique isn't a vibe. It's a sequence. Each phase has clear targets you can measure: angles, foot positions, body lean. The AI tells you which phase in your rep is costing you the most.
Watch a sprints coach review tape. They pause on the same handful of frames every time. The takeoff, the plant, the release, the clearance. The AI pulls those exact frames for you.
Most form errors trace back one or two phases. Fixing the symptom doesn't help. The AI traces the chain back to the cause so you fix the right thing.
Upload a clip, AI tags every phase, marks where technique breaks, and writes a coaching note for each one. The same phase-by-phase read your coach would give, but on every rep, not just meet day.
Follow up in chat and ask questions. The AI remembers your analysis and speaks the language of sprints coaching.
Each phase has a coaching cue, a measurable target, the frames a coach pauses on, and the failure mode AI flags most often. Use it as a self-diagnostic checklist on every video.
Set position, drive angle, and the first 2 strides out of the blocks. World-class sprinters reach ~33% of their max velocity by block clearance, in only ~5% of total race time.
Forward body lean, longer ground-contact times, aggressive horizontal force. The 100m is built or lost in this phase.
Body angle rises smoothly from drive to upright. Stride length grows; ground contact shortens. Speed approaches max.
Top-end speed phase. Vertical force dominates; ground contact ~0.09-0.10 s. Elite peaks at ~11.2 m/s, around 6.27 s.
Holding form through 80-100m as ATP-PC stores deplete. The race is decided here in close finishes.
The numbers coaches grade against. Levels run from beginner through elite, your AI form check compares your reps to the level above you.
Primary sources behind the numbers and methods on this page.
Five common questions about sprints that come up in coaching.
A directory of every sprints page on the site, from broad analysis tools to specific phase deep-dives. Each entry points to a focused write-up.
Download the app. Film a rep. See what the AI sees. Free first analysis, no card, no account required.