So I went to the Y for the first time in several months, because it's getting dark too early to ride long enough outdoors. I spent 45 minutes on the trainer, and death, I thought, was imminent. The trainer is deadly boring, as usual, but I figured that since three hours on the bike outdoors is only moderately challenging, I could do 45 minutes at a middling difficulty (9 of 20) with no trouble on the stationary bike. Man, was I wrong.
Maybe it's because you get no cooling indoors. I was drenched when I finished, and the pathetic little fan on the bike is useless. Maybe it's becuase I've got no hills outdoors. What do you think? Is it really that much harder on a trainer?