The study of extension/contraction, pushing/pulling, posture, bending, reaching, and twisting is called? ergonomics. repetitive strain. body movement. body mechanics.

body movement

Body movement describe the actions of the muscles on the skeleton and most movement have an opposite movement or antagonistic movement such as pushing/pulling, extension/contraction, reaching/twisting and posture/bending. In addition, the different types of movements create various types of synovial joints that gives body motions and tremendous mobility.