Most lost discus performance comes down to a small handful of mistakes. The same ones show up across HS, club, and college athletes. Each one has a clear look on video. Here are the ones the AI flags most often, with the fix for each.
Trail leg drop in hurdles. Takeoff under the top hand in pole vault. Reaching at the board in long jump. The same errors show up in athlete after athlete, and they look the same on video. The AI catches them in the same frame a coach would.
An error in phase 4 of discus usually has its root in phase 2. Fixing the symptom doesn't help. AI traces the chain so you fix the actual cause, not the visible effect.
Every flagged mistake comes with the drill that targets it specifically. No generic drill list, no busywork. The drill that fixes a takeoff issue isn't the drill that fixes a release issue.
Read about mistakes, then upload a clip and see if you have any of them. AI runs the same checks a coach would and tells you in plain language what's happening, plus what to do this week to fix it.
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.
These drills come from coaching practice (Dahlman, Petrov-Bubka tradition, Slippery Rock camps). Each card lists the phase it targets, the method, what to watch for, and a prescribed rep volume.
Initial pivot and balance.
Practice the first 90 deg of rotation slowly. Focus on heel pivot.
Losing balance; arm leading.
Power position to release sequence.
From power position, throw without rotation. Focus on hip-chest-arm-finger.
Arming; release angle wrong.
Half-rotation balance and rhythm.
Practice from south-side to power position only. No full rotation.
Rushing rotation.
Firm block.
From power position, drive into a partner's resistance.
Soft block.
Rotational power.
Med-ball rotational throws with full hip-shoulder sequence.
Arming the ball.
Pattern at varying loads.
Mix of light (1 kg) and heavy (2 kg+) discs.
Letting form break under heavy.
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.
