The sidestroke is a swimming stroke, so named because the swimmer lies on one's side with asymmetric arm and leg motion and it is helpful as a lifesaving technique and is often used for long-distance swimming. The sidestroke allows the swimmer increased endurance because, instead of working both arms and legs simultaneously in the same way, the side stroke uses them simultaneously but differently. A swimmer tired of exercising one side can just turn over and use the other, the change of action helping the limbs to recover.