Vigorous exercise involves minimal health risks for persons in good health or those following a doctor's advice. Far greater risks are present by habitual inactivity and obesity. It enables us to perform up to our potential. Fitness can be described as a condition that helps us look, feel and do our best. It is the ability to endure, to bear up, to withstand stress, to carry on in circumstances where an unfit person could not continue, and is a major basis for good health and well-being.
Physical fitness involves the performance of the heart and lungs, and the muscles of the body.
And, since what we do with our bodies also affects what we can do with our minds, fitness influences to some degree qualities such as mental alertness and emotional stability. As you undertake your fitness program, it's important to remember that fitness is an individual quality that varies from person to person. It is influenced by age, sex, heredity, personal habits, exercise and eating practices. You can't do anything about the first three factors. However, it is within your power to change and improve the others where needed.