exercise

any activity resulting in physical exertion that is intended to maintain physical fitness, to condition the body, or to correct a physical deformity. Exercises may be done actively by the person or passively by a therapist. Aerobic exercises are intended to increase oxygen consumption (as in running) and to benefit the lungs and cardiovascular system, in contrast to isometric exercises . In isotonic exercises, the muscles contract and there is movement, but the force remains the same; this improves joint mobility and muscle strength.