You want to be physically fit so you can live a long life without lots of health problems. Being mentally fit is also important. If you don't believe in yourself or don't like who you are than you are just holding yourself back and hurting yourself in life.
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so you can live a healthy lifestyle and so you can be strong. don't forget to streach
So you can do certain things like run long distances, be able to lift heavy things, and for flexability so you don't pull a hip when your 25.