My younger brothers basketball coach told me to do 500 push-ups a night, and being innocently naive, i said "ok" and did it every night during the summer before entering 7th grade. I did those push-ups, crunches when I got tired from the push-up, and plyometrics that whole summer and the rest is history... :)

The best investment you can make in yourself beside education. Your body is your vehicle that no one can take from you.