Form fundamentals
Foot Strike
Heel, midfoot, or forefoot — what part of your foot hits the ground first.
What it is
Foot strike is which part of the foot contacts the ground first: heel, midfoot, or forefoot. There is no objectively "best" strike — what matters is whether your foot lands under your hips (good) or out in front (overstriding).
Why it matters
Foot strike gets a lot of attention, but on its own it's not predictive of injury. A heel-striker landing under their hip is fine. A forefoot-striker overstriding is in trouble. We surface strike as context for the overstriding metric — not as something to "fix" in isolation.
How we detect it
At each foot contact, we compare the relative vertical positions of your heel, ankle, and toe landmarks. Whichever is lowest at contact wins. We report the dominant strike type plus a breakdown across the video.
How to fix it
Don't force a strike change. If your overstriding grade is good and you're not injured, your strike is fine — leave it alone. Forced midfoot transitions are a leading cause of calf and Achilles injuries.