Running is one of the most popular in the world. Running can burn approximately 200 percent more calories per hour than walking

In walking, one foot is always in contact with the ground, the legs are kept mostly straight and the center of gravity rides along fairly smoothly on top of the legs; in comparison, humans actually jump from one leg to the other while running. Each jump raises the center of gravity during take-off, and lowers it on landing as the knee bends to absorb the shock. At mid arc, both feet are momentarily off of the ground. This continual rise and fall of bodyweight expends a tremendous amount of energy opposing gravity and absorbing shock during take-off and landing.The act of running involves using more energy to accomplish travel over the same distance and running is a less efficient means of locomotion in terms of calories expended, though it is more efficient in terms of distance traveled per unit time.

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