The same comparisons can be made to the heart. Regular, moderate exercise improves your capacity for endurance, meaning you will be able to walk, swim, or bike farther as you continue to work out and make your heart stronger and more efficient. Anyone who has been confined to bed for more than a few days knows that his or her muscles and bones become weak. This occurs because the minerals in the bones are excreted by the kidneys in large quantities during periods of immobility. Exercise builds up strength in the bones by stimulating bone-building cells to create new bone Exercise will help build up bones to help protect against fracture in the future.
Exercise makes people feel good.
People who exercise regularly feel healthy and are less likely to become depressed.