The backstroke is a swimming stroke performed on one's back with alternating circular arm motions and a flutter kick. It provides a full-body workout that strengthens the back, chest, arms, legs, glutes, and core. Swimming backstroke is also a low-impact cardio exercise that can strengthen the heart without high-impact joint stress. It burns calories at a rate comparable to other vigorous activities and can help relieve back pain, correct rounded shoulders, build muscle faster than other exercises, and reduce osteoarthritis pain.