Experts define physical fitness as “one's ability to execute daily activities with optimal performance, endurance, and strength with the management of disease, fatigue, and stress and reduced sedentary behavior.” This description goes beyond being able to run quickly or lift heavy weights.

Most often, measures of fitness involve these key areas: Aerobic fitness, which involves how well the heart uses oxygen. Muscle strength and endurance, which involve how hard and long muscles can work. Flexibility, which is how able joints are to move through their full range of motion.

Total fitness can be defined by how well the body performs in each one of the components of physical fitness as a whole. It is not enough to be able to bench press your body weight. You also need to determine how well you can handle running a mile etc.

Physical fitness is to the human body what fine tuning is to an engine. 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. Physical fitness involves the performance of the heart and lungs, and the muscles of the body.