Phase-by-phase break
Your javelin broken into the phases coaches grade. AI tells you which phase is costing you the most and why.
Javelin form check on demand. Upload a clip of your javelin 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 javelin 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 javelin 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 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.
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.
6-10 strides at moderate pace, building to controllable speed (5-6 m/s elite). Not a sprint; control is critical.
2-3 lateral crossovers preceding the throw. Right foot crosses behind left (RH thrower), turning the body sideways.
Last crossover lands long, lowering CoM. Loads the throwing leg.
Front (left) leg plants firmly to stop forward momentum, converting it to rotational and vertical lift via the trunk and arm.
Trunk arches and unloads (whip), arm comes through last (kinetic chain). Javelin released at 30-36 deg with velocity 28-30 m/s elite.
Right leg lands forward to absorb momentum. Stay behind the foul line.
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.