I wondered if it was about that where u are, and if you were exercising in the cold.
IS, it was in the 30s today. I just went for a 26 mile ride tonight, although it may have not been the best idea. Biking season is coming to a close though. It's going to be sporadic at best for awhile. I'll mix it up with a combination of running, hiking, and walking. I can't do a treadmill, either.