As for arms, work your arms lol. Honestly things like loosening a bolt require more core strength, so work your back, chest, abs a little more. Really you should just try to bring your whole body up. Compound movements like squat, bench, and deadlift work everything.
Keep a small cheater bar handy, break any bolt loose!!
As for moobs, diet and cardio are it, gotta burn that fat. I actually carry a lot of fat in my chest to, first place I notice it.