Thanks for that message, Becky. The ten minute mile seems to be my limit, although I never really pushed myself. I was so proud of myself for actually running 4-5 miles last year, until my back started acting up. I felt lucky that I had absolutely no shin or knee problems because I started so slowly. As in cycling, I seem to be more of an endurance person than a speed person.
I have a big cycling trip to Spain in the middle of May. Right now I'm doing some serious (for me) indoor training for that and I hope to be out on the road by March 10th or so. Although I usually get outside on the bike by then, I need to do longer distances, earlier in the season than usual. Running fatigues my body in a way that sort of interferes with cycling, so that's my issue. I can continue running 2 times a week, with no ill effects, but then I never improve. Cycling is my first love, and although I'll never be as fast as I used to be, I don't want to hurt when I am riding.