Sports are the Key!

In our school, you hear guys and sometimes girls say all the time, "I'm going to be a professional ball player."  As out of reach as that may appear to many of us, for that person, there is no other truth because they LOVE the way they feel when in the game.   So what's the 411 about the positives and negatives of playing sports?  What affects does a female playing sports have on her self-esteem, etc.?  Is there such thing as overkill?  Tell us what's sports have done for you in your life.