Swimming exercise uses more of the overall muscle mass of the body than almost any other form of exercise, and people get an upper-body workout and a lower-body workout, unlike running or biking or other activities like tennis, where you get a good workout in just the legs.  Â
Swimming exercise provides a highly aerobic and cardiovascular workout to a person and is generally kinder to your body than land-based exercise. Your natural buoyancy in the water creates less impact, helping you avoid the jarring knocks that can cause injuries.