Hey ShyGuy:
You have a nice body to start with, but like all of us, you can make a good thing better. I joined a gym a month ago after my previous membership lapsed a few years back. Even though I've been an active cyclist, we need the upper body workout, too. It's already made a difference. If you join a gym, they'll work with you to set you up with a routine. As you go along, raise the weights when the exercises get too easy. Cross train with some kind of cardio as well. It will make a difference for you, especially if you put forth a serious effort.