Getting Rid of Man Boobs – Losing Man Boobs

I know I should loose weight but I have so- called man boobs. What excercise should help with those. Pushups?

Is there a certain excercise or routine to help my loose my man boobs?
I just got a resistance band, and I’m starting to do situps, will those help eliminate my man boobs?
Are man boobs even possible to eliminate and turn into muscle?