A press up, also push up, is a common strength training exercise performed in a prone position, lying horizontal and face down, raising and lowering the body using the arms. They 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, especially, in military physical training. A push up can also be performed in a standing position against a wall.