Perfect form in discus isn't about looking smooth. It's about hitting the targets coaches measure, phase by phase. Here's what perfect discus form looks like at each phase, what coaches grade for, and how the AI compares your form to the standard frame by frame.
Each phase of discus has a target. Takeoff angle. Body lean. Foot strike. Release height. "Perfect" means hitting the target on each phase, in order. The AI grades against the targets, not against how the rep looks.
A frame can look ugly and still work. A clean-looking frame can still cost you. The AI grades the mechanics, not the look. You stop chasing pretty form and start chasing the targets that matter.
Don't compare yourself to a pro's highlight reel. Compare your phase 2 to the standard for phase 2. The AI does this for you and tells you the gap, frame by frame.
Upload a clip, AI grades each phase against the form standard, and tells you the specific gap to close. Not a vague "work on your technique," a concrete read on which target you're under and by how much.
Follow up in chat and ask questions. The AI remembers your analysis and speaks the language of discus 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.
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.
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 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.
