Phase-by-phase break
Your discus broken into the phases coaches grade. AI tells you which phase is costing you the most and why.
Discus form check on demand. Upload a clip of your discus 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 discus 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 discus 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 discus 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.
Your body leans sideways during the spin, tilting the release plane and causing a low, flat throw.
Pivot drills without the discus, focus on a vertical spine through the turn.
Your right foot lands past 90 degrees at the power position, pre-breaking separation and reducing release speed.
Active-right-foot drills with a cue to land the foot pointing back toward the start of the circle.
Your throwing arm trails too far behind the hip, flattening disc flight and forcing a low release.
Standing-throw drills with a cue 'arm follows hip', keep the arm in the power pocket.
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.
Discus rests on first joints of fingers, hand spread. Stand at the back of the circle, feet shoulder-width.
1-2 swings to load the throwing shoulder. Builds rhythm and torque.
Body rotates 1.75 turns across the circle. Feet move heel-toe-heel pattern. Major contributor to angular momentum.
Right foot lands first (still rotating), then left foot blocks. Hip-shoulder separation maxes here. Trunk rotation velocity = 40% of release velocity.
Hips lead; shoulders unwind; arm fires last. Discus released at 32-37 deg with release velocity 20-25 m/s.
Right leg switches forward to absorb momentum.
Primary sources behind the numbers and methods on this page.
Five common questions about discus that come up in coaching.
A directory of every discus 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.