Hi,

I ended up tendinitis in my upper right calf a couple of winters ago after just one over-aggressive Spinervals session. I was doing the "stop-start" drill in a fairly tough gear. My calf hurt for quite a long time after that, despite stretching and icing. I finally went to physical therapy, though he didn't do much more for it than I had been doing -- more stretches, more icing, cross-friction massage. It just took time to heal. I never do those stop-start drills any more. Not sure that walking in heels could cause the same thing, but it hurt in the same place. If it is tendinitis, rest, ice, and stretching are about all you can do for it.

Good luck!
Emily