Gravity plays an essential role in terrestrial locomotion. Due to gravity we can hit the ground without losing contact with it. However, because of gravity, work has to be done each step to lift the body even when moving on a level surface. Gravity and the braking action of the ground interact during locomotion with two different energy conserving strategies: the pendular mechanism of walking, up to intermediate speeds, and the bouncing mechanism of running, up to the highest speeds attainable.
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