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).
[1] 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.
[2] 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.
[3] The term
"running" can refer to a variety of speeds
ranging from jogging to sprinting.