A bit more about me--I also enjoy running. I recently completed my first half-marathon (The Atlanta Half-Marathon, held Thanksgiving morning, November 27, 2008). I was on a pace to finish in under 2:30 (my rough goal), but around mile 10, my right calf muscle seized up. I stopped and tried to stretch it, but every time I would start to run on it again it would spasm after the first couple of strides. I ended up having to "power walk" the last 2.5 miles. I finished it in 2:50. I am planning on running the ING Half Marathon coming up March 29th and am hoping for a better result.
The running has helped with cardio (although I still gas somewhat during rolling), so it all works together nicely.