If you don't use your body, you will surely lose it. Your muscles will become flabby and weak. Your heart and lungs won't function efficiently. And your joints will be stiff and easily injured.
Regular exercise is necessary for physical fitness and good health.
It reduces the risk of heart disease, cancer, high blood pressure, diabetes and other diseases. It can improve your appearance and delay the aging process. When you exercise, your body uses energy to keep going. Aerobic exercise involves continuous and rhythmic physical motion, such as walking and bicycling. It improves your stamina by training your body to become more efficient and use less energy for the same amount of work.