Running is a method of terrestrial locomotion by which humans and other
animals move rapidly on foot. Running is a gait with an aerial phase in
which all feet are above the ground (though there are exceptions). This
is in contrast to walking, where one foot is always in contact with the
ground, the legs are kept mostly straight, and the center of gravity
vaults over the stance leg or legs in an inverted pendulum
fashion.Running in humans is associated with improved health and life
expectancy.
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