It's not a cold, but it's something. I feel weirdly weak in the morning. The weakness abates somewhat if I eat and abates more if I eat a lot. That's not a good thing when I'm trying to lose weight, however.
Did a 90-minute class today. It was an hour and half version of yesterday's class, when I backed off after the warm up. Had to do it again today: did the warm up and it left me bathed in sweat. So, during the meat of the class -- steady 50 minutes in zones 2 and 3 with cadence play -- I backed off again, doing the prescribed cadence and resistance occasionally, then going easier when I felt tired. I felt tired more often than I would have liked, so there was a lot of backing off. Not sure what's going on but I think I felt better than yesterday. Hoping for more improvement tomorrow and thereafter.