When we exercise, we move different parts of our body. It depends on the type of exercise we engage in. There are different types of exercise. We have aerobic, anaerobic and flexibility exercises. Our body muscles are most actively working during exercise. At that time, the muscles usually demand more oxygen and blood supply. If there’s low oxygen supply, lactic acid will build up in the muscle tissues and cause pain. But when the muscles relax, the pain will disappear because there’s less muscular activity and less oxygen demand. Normal oxygen supply to the muscles does not allow lactic acid to build up, and therefore, prevents pain. Also, blood that circulates through the muscle tissue carries away the lactic acid produced and metabolic products. Regular exercise increases growth and development, prevents aging, boosts the immune system, prevents the 'diseases of affluence' such as coronary heart disease, type 2 diabetes, and obesity. Exercise also prevents stress and depression, increases quality of sleep, promotes mental health, maintains steady digestion and treat constipation and strengthens the muscles.
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