Full-body exercise, including running when you hit the ball and catch it, reflects the muscle strength and endurance of all parts, as well as the heart and lungs. This is a comprehensive project with strong coordination. Although I feel that my legs are running and my arms are exerting strength, every movement is actually accomplished through coordination, from the big stroke to the forearm to the wrist, from the leg to the waist, to the torso twisting to reaching out.