With every step of a run, the feet repeatedly push on the ground with a force more than twice the bodyweight. When the front of the foot is loaded in this way, the foot maintains it's shape because of its stiffness. The dots attached to this runner's foot show how the foot slightly bends when it is pushing on the ground. Video produced by Ali Yawar, Carolyn Eng, and Madhusudhan Venkadesan at Yale University. Full details in the paper that is published in Nature:
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The treadmill was set to 3.2 m/s in this video. That is approximately 7.2 mi/h, 11.5 km/h, 8 min 23 s per mile, or 5 min 12 s per km.
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