I prefer not to run in the winter - I've done it before, I just don't enjoy it at all - and being in Boston during one of the worst/snowiest winters in history makes it even less desirable. The treadmills at my YMCA are either busted or have a long wait, so my former-varsity-swimmer boyfriend and I took up swimming in October and have been swimming three times per week ever since.

My question is for the runners: What benefits have you runners seen from incorporating swimming into your routine, whether it was a temporary replacement (like it is for me) or if you did so as cross-training cardio? I don't see any physical changes in myself, but I do know that swimming is helping my lung capacity and helps me pace my breathing better (something I've always been awful at). Are there any other benefits to incorporating swimming into a runner's fitness regimen?

Thanks.