No, maybe not. Your body may not show it now, but it needs exercise to keep well. Your general health depends on strong bones, toned muscles and proper use of energy. You heart will stay younger and work better with exercise. You will stay slim if you burn up the fat from food. You will be strong if you swim or do weightlifting or boxing because these exercises help the muscles work better. If you want to dance or walk long distances or play game with your children, you really must continue to exercise.