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Soft Knees

Your legs are springs, and a slightly bent knee at landing is what lets them absorb impact. If you land on a straight, locked leg, there's no give — you brake hard and send a jolt up through your joints, which usually means you're overstriding.

FilmableFilm this on your phone and TrueForm measures your body mechanics and tells you what to fix. You get angles, not a made-up score.

What the camera readsRunning gaitFilm from the side

More intermediate Distance Running skills

All Distance Running skills