Physical exercise is a major contributor to health and can improve the body in three ways: a more efficient heart and lungs improve muscle tone and more supple joints. It is also essential to prevent obesity. Due to regular exercise, the blood supply to muscle increases, it results in a supply of more O2. Further aerobic exercises make overall body metabolism more efficient, improve digestion, and enhances neuromuscular coordination. Heartbeat enlarges so that more blood is pumped out with each beat, fat deposits are cleared from the blood vessels and the lungs become more efficient in gaseous exchange. These benefits may be temporary or permanent on the basis of regular and vigorous exercises. Aerobic exercises do not cause the muscle to increase in size, even though the exercise may go on for hours. Aerobic exercises increase the adaptability of muscles and give greater endurance to muscles. To gain good health, it is suggested that a total of at least 20 minutes per day, of moderate exercise, to burn around 200 calories (837 joules) a day, is required. Regular exercises are preferable to occasional intense sessions.
Aerobic exercise means physical activity that encourages the utilization of oxygen to provide energy for exercising muscles. The efficiency of pumping action of the heart improves and blood vessels open up to accommodate an increased amount of blood being pumped by the heart. Obesity is found in persons who lead sedentary lives and pay less important to exercise. School children who spend too much time on studies and who do not exercise or who do not participate in school games or use vehicles for commuting to schools. Proper exercise for proper goal is necessary.