In addition, running requires a muscles.Action Fuel PRO SWIMMING Swimming is another complete body workout. You will see a buildup in the muscles of the shoulders and arms particularly when there is an overhand stroke such as the Australian crawl. Also, muscles of the hips and thighs are required in order to perform the various kick strokes. TENNIS Tennis requires a level of complete fitness, but particularly in the muscles of the back, shoulders, and arms. In addition, the ability to move around the court quickly requires legs, thighs and calf muscles that are trim and fit.