My foot felt fine when I woke up this morning, but within 5 minutes on the treadmill, I knew that there was in fact a blister. It burned and burned and I felt like 6 miles would be undoable. Stopped at 4, immediately went to walgreens (the gym and the store share a parking lot.) I picked up some moleskin. I will get these final 2 miles done. I have a hot rag on it now.