I'm on diet , and I go to the gym and exercise for 4 hrs a day , but i gain weight !! why is that ? while month ago I was on diet and just doing exercise for 1.5 hr ( walking around my house) , but from the time i goto the gym and hard exercise , i'm gaining weight , why is that ? my friends saying you're gaining muscle , but the thing is i feel i'm not such comfortable when i put my skirt on, so this whole " gaining muscle story " doesn't make sense to me , plz help !!!