I have a friend who is ALWAYS sncking, is very thin, and never eats regular meals. When I was at her house this weekend, we hardly moved either. We played video games and watched anime (lol...BUT I EXCERSISE AT HOME THOUGH!!!)
But when Her mom bought KFCc home, she had half a peice of chicken, and took out a bag of chips instead of what her mom brought.
Now if I did that....
(eating less, too... plus riding bike everyday for 5 minutes then trampoline whenever I feel like it. which is ALWAYS...)
..could it help alittle? lolz XD

I'm not very big either, I'm 145 ibs. and 5'5,(14 years ^_^) but my friend is 132 ibs. and 5'6, so...
I don't really ride my bike (only to get around) becuase I feel like people are always staring at me D=