Swimming burns 750 calories or more per hour, and places very little stress on the joints. For these reasons, many athletes choose swimming over other training exercises like running and cycling, both of which can cause long term damage to the body's joints and muscles.
Many swimmers participate in this activity to stay trim and lean, but swimming also conditions the heart and strengthens the core. Frequent swim sessions also help athletes stay flexible and work to reduce the amount of toxins in the body. Swimming also contributes to lean muscle development, which has a positive effect on the body's metabolism.