Working out at Boarding School

Hey GUYS!
Before i say anything i must admit that i am totally clueless about what to do and what not to do when it comes to physical fitness. Since this is my first post ill explain my current conditions. I am 15 years old and at boarding school. I am a golfer, baseball player, and wrestler. I have been doing pushups and situps for the past couple of day and have figured out that i can do between 90-120 situps and 40-50 pushups before i need to take a break. I can run between a 5:50 and 6 minute mile. And as to genetics my family is full of short stockey people, i am almost the only exception (both my dad and grandfather were running backs in college). What can i do WITHOUT WEIGHTS to build "toned" muscle particularly my abs and pecks? (i do no have access to weights at this time because the football players have figured out how to hog the weight room so that nobody else can get in there). Any help on good exersises that you guys can provide i would much apprecieate.

Thank You

Chuck

Btw.. here is acurrent picture, im not sure if it will be helpful but im trying to cover any possible questions you guys might have. Also if its possible i would like to stay in the same weight range that i am in (for wrestling purposes) but if that is not possible... well then im willing to accept that. Thanks for the help in advance!
 
Urm, am I the only one who can't see pic?

How tall are you?
Try different variations of push ups. Pecs will come naturally, mine did. Also exercise your legs. Do squats and other leg exercises. Try and get hold of dumbells as well. I got some about a month back and they have done wonders.
 
You will not increase muscle mass without proper nutrition, simple as that. Doing varying types of pushups is going to do very little.
 
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