It's complicated, 2manybikes. I know about rest days, but with diabetes, I need to control sugar levels every day, and riding is the primary solution. In other words, if I don't ride, I don't get to eat, and I just love food. Weight and overall fitness have greatly improved since getting the diagnosis, but those are only secondary goals. At least I've found a form of exercise that is neither boring nor painful, and I've managed to stay away from medication.
Anyway, it's reassuring to know I'm not the only one to have bad days, and that sometimes rides that start out bad turn out well, more often than not.
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Some people are like a Slinky ... not really good for anything, but you still can't help but smile when you shove them down the stairs.