Push Ups

A press-up (British English) or push up (American English) is a common calisthenics exercise performed in a prone position, lying horizontal and face down, raising and lowering the body using the arms.
Press-ups develop the pectoral muscles and triceps, with ancillary benefits to the deltoids, serratus anterior, coracobrachialis and the midsection as a whole.
Press-ups are a basic exercise used in civilian athletic training or physical education and commonly in military physical training. Press-ups are a common form of punishment used in the military and in school sport.