<p>Physiology is an academic subject that deals with the mechanisms of the human body function. Any kind of activity requires alteration in the normal body function. It is important to understand the normal body function first and then the limits of the functions to understand the exceptional feats performed by the athlete. This understanding is essential to alter the body&#39;s functions to suit the needs of sports. Exercise and a good diet are both important for health. A healthy diet includes three main nutrients, namely carbohydrates, proteins and fats. Diet provides the energy we need from the correct proportions of nutrients. It should have a wide variety of different foods and drinks to ensure all the vitamins and minerals.</p>