Gym classes provide students with physical exercise on a consistent basis. It is particularly important for the physical well-being of children who do not engage in physical activities outside of school. A good physical education class will feature activities that raise the heart rate, increase the pulse rate and rev up metabolism. According to the American Heart Association, gym classes can help teach children skills that can help them be active their whole lives. The physical exertion also helps the mind, as children will find they are able to think more clearly and are able to focus better in other classes following a physical education period.