Aerobic exercise pumps oxygenated blood from the heart to working muscles. To accomplish that, it stimulates the heart and breathing rates throughout your exercise session. As a rule aerobic exercise can be light-to-medium intensity activities that can be performed for extended periods of time, such as walking, jogging or biking. Whatever your age, weight or athletic ability, aerobic activity is a health booster that gains efficiency as your body adapts and gets stronger and fitter!
The average person loses one-half percent of muscle mass every year after age 30, which means it's important to build muscle while you mature. Strength training can prevent two common causes of disability -- frail muscles and brittle bones.