No matter to which age group you belong to b it the teen age or the 20's or 30's it is a must to love and take care of your body. To get and maintain a healthy body you ought to connect yourself to a routine with regular exercise schedule. If your body has the capability to do everything and enjoy doing leisure activities as well, then you are physically fit. Also, for a fit body it is easy to take on the stress and do some work even in times that are adverse.
Physical fitness is all about god health of heart, muscles, lungs and all the body parts. The fitness of the body is based on the restrictions that are put on the body physically and what all one is able to do in a certain lifestyle, like what you eat and what are your habits.