Phase by phase, not gut feel
Good discus 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.
Discus technique is about precision. Every discus 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 discus 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 discus 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 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.