Unbent knees in heel strike running vs bending knees in forefoot strike running
unbent-knees-vs-bending-knees-heel-running-vs-forefoot-running-bretta-riches-run-forefoot
Above, shows heel strikers with full knee extension which increases stride length and deceleration compared with forefoot running (below) in which both knees are bent and compliant, cutting down on braking.
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