Your muscles need exercise. The heart, a muscle, needs to work vigorously in order to keep the blood vessels that feed into the heart healthy. In fact, every system in your body improves with exercise. Your skin looks healthier and younger. Bones retain their calcium better, helping you avoid osteoporosis, the bone thinning associated with old age and inactivity.
Exercise helps the joints remain flexible and greatly improves muscle strength and tone.
By reducing stress, exercise helps bolster your enthusiasm and optimism. You'll even sleep better. If you want to lose weight, exercise helps in two ways. It controls your appetite and increases your metabolic rate, so you use calories faster. According to a study done at the National Institutes of Health, from 1992 to 1993 the average weight for adults in the U.S. was 171 pounds.