These are just a few of the sites that will aid in learning more about exercise and the body itself. I feel it is very important to know about your own body and how it functions. It can give you much help in increasing the longevity of your life. Keep in mind it can be unhealthy to overtrain your body, but a few times a week never did any real damage, for most people. Eating healthy is important also, you don't want to have a body that merely looks good on the outside, but is damaged on the inside. I'm sure you want the entire package to be fully healthy. If you are a beginner at exercise, take your time to try out different routines to see which works to your best benefit.