You can't regain in a few days or weeks what you have lost in years of sedentary living, but you can get it back if you persevere. And the prize is worth the price. 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.
There is widespread agreement that these four components are basic. Cardiorespiratory Endurance - the ability to deliver oxygen and nutrients to tissues, and to remove wastes, over sustained periods of time. Long runs and swims are among the methods employed in measuring this component. Muscular Strength - the ability of a muscle to exert force for a brief period of time. Muscular Endurance - the ability of a muscle, or a group of muscles, to sustain repeated contractions or to continue applying force against a fixed object.