Did a Comp-u- Trainer class today for 2hrs at one of the local LBS, since we're dealing with snow AGAIN. Great workout, not better than outdoors, but better than the boredom on a trainer alone, and challenging since the resistance was mixed up for LT threshold intervals, and VO2 max intervals as well. But I think my brain is calcifying for the lack of fresh air. About 1hr in, I noticed a "thunk" that I thought might be coming from the resistance unit on the rear, turns out I was dragging a brake pad. Suffering makes you stronger I guess...