Regular physical activity induces biochemical changes within your body. Some of these changes are similar to those produced by nicotine. Exercise boosts catecholamines, producing increased alertness and mental sharpness. Sustained exercise increases the brain's production of endorphins, which produce euphoria and a pleasant sense of wellbeing. Regular exercise helps you cope more effectively with the daily hassles of modern life.
Exercise also decreases feelings of anxiety and depression.
In addition, it produces more restful sleep, which in turn helps you stay calm and deal more effectively with stress. Regular, gentle exercise tones your muscles and helps them feel more relaxed and strong. The aerobic and relaxing effects help to reduce stress and fatigue. Regular exercise can produce positive personality changes. You will experience a sense of accomplishment.