The Benefits of Fitness Fitness and Health The word health is often associated only with physical fitness, but there are other components of health. FITNESS means “readiness”. Fit people are better equipped than non-fit people. The level of fitness includes all aspects of health and life. It affects physical, mental, and social health. What is Physical Fitness? Physical Fitness is the ability of your body systems to work efficiently. A fit person is able to carry out the typical activities of living, such as work, and still have enough energy and vigor to respond to emergency situations and to enjoy leisure time activities.