Physical fitness is the ability of your body to do the work required of it. Although all body systems contribute to fitness, the muscles are the primary actors. In order to do their work, muscles need oxygen. They get it from blood, which is oxygenated by the lungs and pumped by the heart. Fitness depends on healthy lungs and a healthy heart supplying plenty of oxygen to strong muscles.
There are three main components of physical fitness... ENDURANCE, STRENGTH, and FLEXIBILITY.
ENDURANCE depends on the heart, lungs and blood vessels delivering oxygen rich blood efficiently to all tissues in the body, including the muscles, and carrying away the carbon dioxide and other waste products. To put it simply, aerobic fitness = endurance. Aerobic exercise increases your endurance.
STRENGTH: This is the ability of your muscles to exert force to push, pull, or lift an object, including your own body. To put it simply, muscular fitness = strength + endurance.
FLEXIBILITY: also referred to as range of motion, it is the ability to bend and stretch easily. Muscles, joints, and the tissues that connect them (ligaments and tendons) all play a major part in how well you can bend and stretch.
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