ur very light for a 15 year old ![Tongue :P](http://www.projumpforum.co.uk/Smileys/default/tongue.gif)
I was very fit when I was 16 and weighed in at about 6 stone! I ate like a horse, but I'm hyperactive, so always on the go!
I agree, the M60's should be a good start point, and hopefully last a while!
Good luck bouncing Trendkill!