Phase-by-phase break
Your relays broken into the phases coaches grade. AI tells you which phase is costing you the most and why.
Relays form check on demand. Upload a clip of your relays and AI flags every break in technique with priority tags, what's critical, what's minor, plus the drill that fixes each one. The same form-check feedback you'd post for online, private and immediate.
Your relays broken into the phases coaches grade. AI tells you which phase is costing you the most and why.
When a coach says "your form is off," you don't always know where. AI marks the exact frame the error appears, with a coaching note attached.
Every flagged error comes with the drill that targets it. No generic homework, no guessing what to work on next session.
You'll see priority-tagged technique notes, the specific frames where the form breaks, and the drill that targets each issue. It's a full relays form check in under a minute, the kind you'd pay an expensive remote coach for.
Follow up in chat and ask questions. The AI remembers your analysis and speaks the language of relays coaching.
Each fault below is described two ways: how it looks on video (so you can recognize it on your own clips) and the drill or cue that fixes it. AI form check identifies these patterns in the same frames a coach would.
Outgoing runner leaves too early or too late, forcing deceleration or a rushed pass inside the zone.
Controlled-speed exchange reps with a measured and re-measured go-mark at practice pace vs race pace.
Outgoing runner's receiving hand drops or moves during the call, creating a drop risk on hand-off.
Fixed-target hand drills, focus on arm staying locked until baton hits the palm.
Runners drift toward the outside of the lane during the handoff, risking a lane violation in a meet.
Lane-line awareness drills, use a short blue line as a cue during practice exchanges.
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.
Incoming runner sprints at maximum speed into the exchange zone. Speed retention is the entire job.
Outgoing runner waits at the back of the 10 m acceleration zone. They start sprinting when the incoming runner crosses the go-mark.
Outgoing runner accelerates blind. The 10 m acceleration zone (added in 2018) gives time to build speed before the 20 m exchange zone.
Incoming runner calls 'stick' (or similar) when ~2 arm-lengths away. Outgoing throws hand back, palm up (upsweep) or down (downsweep), held still.
Incoming runner places (not throws) the baton firmly into the outgoing's hand. Both runners maintain speed.
Outgoing runner accelerates out of the zone with the baton, into their own race phase.
Primary sources behind the numbers and methods on this page.
Five common questions about relays that come up in coaching.
A directory of every relays 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.