It isn ' t about working out the chest , it ' s about working out to lose weight in your case . When you gain weight your boobs get bigger , so you need to stopgaining weight assuming this based on you saying you ' ve developed a gut . Was a small B cup in high school . Gained a lot of weight in my 20 s and went up to a large C . Being on T may help divert any future fat deposits elsewhere , but the only thing to guarantee that your boobs won ' t grow would be top surgery . <| sep |> I find that occasionally at seminars , people get a little overzealous , and practice a little harderfaster than normally . Since you ' re newish , this might be a bit of a surprise to you . So don ' t be shy about asking your partner to slow down or go a little easy .