Could i gain muscle on my arms, chest and stomach without going to the gym? Or

turn my chest fat into muscle? turn my chest fat into muscle rather. I have about 2 or 3 inches fat around my belly from the recent boozing and christmas pigging out.. I want to get toned abs and turn my man boobs (they're not that big so i assume they can muscle up easily lol i just dont know how to do it) into muscle. What exercises would i have to do to achieve all there things, basically a more.. Defined? Upper body. Reason for not going to the gym is that i'm skint!
 
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