Physical activity is defined as any bodily movement produced by skeletal muscles that require energy expenditure. The term “Physical activity” is not equal to “exercise”. Exercise is a subcategory of physical activity which is structured, repetitive, and purposeful. “A sound body has a sound mind” It means that if a person is weak, dull, and sick, he is not able to do his work efficiently and quickly. It is very important to have a fresh mind before any work, like office work, study or some creative work. The people who make exercise as essential part of their routine are more happy and efficient than others. Exercise does not mean to go to gym or some club for daily activity; it only means to do some physical activity no matter how and where. Exercise is useful in preventing or treating coronary heart disease, osteoporosis, weakness, diabetes, obesity, and depression. Strengthening exercises provide appropriate resistance to the muscles to increase endurance and strength. Cardiac rehabilitation exercises are developed and individualized to improve the cardiovascular system for prevention and rehabilitation of cardiac disorders and diseases. A well-balanced exercise program can improve general health, build endurance, and slow many of the effects of aging. The benefits of exercise not only improve physical health, but also enhance emotional well-being. Regular physical activity remains an essential behavior for endorsing health, postponing or preventing predominant musculoskeletal disorders such as mechanical low back pain, neck and shoulder pain and decreasing the risk of increasing coronary heart disease, hypertension, diabetes, osteoporosis, obesity and colon cancers. The period of adolescence represents the transition from childhood to adulthood and lifetime habits such as regular exercise are normally begun at this time. But unfortunately research indicated that physical activity rates decline consistently during the adolescent years. No matter what your age or shape, you should exercise daily. Not only does exercise so you can wear your favorite dress, it strengthens your muscles, keeps your bones strong, and improves your skin, increased relaxation, better sleep and mood, strong immune function, and more. Daily exercise helps in strengthening of heart muscles. It helps maintain desired cholesterol levels. Daily physical activity reduces one’s chances of stroke and the risk of heart disease. Regular exercise lowers blood pressure and improves blood circulation. Exercise helps in reduction of excess body weight leading to lower blood pressure. Exercise results in the burning of calories. If supplemented with proper nutrition, exercise is the way to prevent obesity. Any healthy person may become unfit physically if he does not practice exercise regularly. The efficiency of our muscles reduces if we are not doing regular physical workout. So we must do physical fitness exercises every day.