The ability of organisms to change position, by using their body parts, is called movement. There are two kinds of activities: The organisms move their body parts without changing their position. Animals move from one place to another. This kind of movement is called locomotion. Body movements will acquaint us with the human body and its movements, which includes a brief introduction of ball and socket joints, pivotal joints, hinge joints, fixed joints. This chapter also has topics related to the gait of animals with examples of earthworm, snail, birds, fish and snakes.