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.A feature of a running body from the
viewpoint of spring-mass mechanics is that changes in kinetic and potential energy within a stride co-occur, with energy
storage accomplished by springy tendons and passive muscle elasticity.The term "running" can refer to a variety of
speeds ranging from jogging to sprinting.
Running in humans is associated with improved health and life expectancy.
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