Then go out an practice your technique and hit some pads or a heavy bag. I know too many muscle-bound behemoths who spend life times in the free weights section of the gym and still throw shots like little girls. Working on your actual technique is going to be better for your striking than maxing your bench.
If you want other things that may teach you how to utilize your muscles, plyometrics work wonders, and so does stretching. If you can't move your limbs in the proper range of motion, you won't be able to strike worth a damn.
Aside from that, find an axe and a big tree, or a truck tire and sledgehammer and go to town. It teaches you how to co-ordinate the whole of your body into your striking movements (not just your arms), and also teaches you control if you want to keep your kneecaps intact. That is, if you are doing it right.
It doesn't matter if you agree or disagree
... As long as I don't bore you and I spark a moment of thought, my goal is achieved
Queng leon queng tigre ecu tacacut, queca pa? - Pampangan Mandarigma Motto