I do a fair amount of strength training in addition to jogging, so I'm not sure what to attribute to which activity, but before I began strength training the differences I noticed were mainly just that I was smaller. Of course, smaller means that your muscles start to be revealed. For instance, I've been fencing and jogging a lot, neither of which work my arms at all, and, in fact, I've been being pretty bad about strength training with my upper body. But I have MUCH more muscle definition in my arms now, even though I suspect I have lost some muscle mass.
So in my experience running helps, but strength training is good too. It's not that hard to do, even without weights and things- frog jumps, ****-inducing as they are, are an excellent way to build muscle in your thighs, and fitness lunges work basically everywhere in your legs. Strength training can also help keep your muscle strength even in your legs when you're jogging- if you jog/run too much, some muscles get much stronger than others, which can cause you joint pain.
Last edited by ImpalaHoarder; 01-13-2008 at 10:49 PM.