Looking back at the training log, I see that I had a running streak from 11/26 to 12/15 with at least 4 miles every day. It wasn't intentional; in fact if anything, it was the result of not being able to do long enough runs, so I had to run on my rest days to get the mileage in. In any case, that is 20 days or running every day. Maybe that's why I feel guilty even on my scheduled rest day now.