Most lost javelin 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 javelin 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 javelin 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 tip drifts downward in the power position, flattening flight and cutting 5-8 meters on a good throw.
Carry drills with a tip-up cue, and plant-and-freeze reps to groove the horizontal carry.
Your arm fires before the block foot lands, leaking energy before the chain can transfer cleanly.
Delayed-arm stand-throws, focus on feeling the block foot first, arm second.
Your plant leg bends on the block, losing the deceleration that transfers momentum into the throw.
Heavy-block drills against a board, and single-leg Nordic work to groove a stiff plant.
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.
Block leg + release sequence.
From a standing position, throw without approach. Focus on hip-chest-arm.
Arming; release angle wrong.
Full sequence at low speed.
5-step approach with 1 crossover, full throw.
Rushing; weak block.
Crossover pattern.
Practice 2-3 crossovers, javelin held back. No throw.
Crossing too short; javelin coming forward.
Firm block.
Plant front leg into a partner's resistance from a 3-step approach.
Soft block.
Trunk arch and whip.
Med-ball overhead throws, focus on arch and arm whip.
All arm, no trunk.
Race-pace pattern.
Full 8-10 stride approach + crossovers + throw at competition weight.
Rushing approach speed.
Primary sources behind the numbers and methods on this page.
Five common questions about javelin that come up in coaching.
A directory of every javelin 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.
