Humanity’s peculiar gait has long confounded engineers and biomechanists—but it might be one of nature’s clever tricks.
routine, walking is shockingly complicated. Biomechanists break a single step into several phases: First there’s touchdown, when your heel strikes the floor. Next comes the single support phase, when you’re balancing on that leg. After that, you roll onto your toes for takeoff and your leg goes into a forward swing.
“The foot is the key element here,” says Daniel Renjewski, a mechanical engineer who led the study. The human foot is, frankly, kind of an oddity in the animal kingdom. People have a 90-degree angle between the foot and the leg, he continues, but few other animals do. That means most animals walk on their tiptoes or the balls of their feet, while we walk heel-to-toe.
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