So today was going to be an easy day at the gym. Instead of using 53x16 I was going to ride in 53x17, a gear significantly enough smaller to allow for recovery. It allows recovery when one rides at lower cadence and against lower resistance. This I could not accomplish, however. The gear felt so easy that I rode at 100+ rpm. And I decided to ride use my higher gear training zones. At 200 watts 53x17 is significantly easier than 53x16, as is 220 watts, etc. That was the theory, but I was sweating profusely anyway. And my heart rate was climbing too. During the warm up it hovered in 120s-130s. I wanted to bring it up to 140s and stay there. I got to 140s all right, and as riding intensity increased, my heart rate kept going. I was in 150s for a while, maxing out at 161, about 12 beats higher than I'd planned. Thirty-three minutes and thirty-three seconds of failed recovery was enough and I climbed off.