I walked 30 minutes on two days this week in my Birkenstocks. They felt all right while I was doing it, but this morning for the first time in I can't even remember how long, when I got up I had heel pain again. So I guess I must have inflamed by heel by not giving it the right kind of support it needed while I walked.
I don't want it to get as bad as it was before so I sure won't be walking in those Birkenstocks again and I suppose I need to stay off the treadmill until I've had some healing time.