You're not going off topic, are you? Wicked creature.You guys are exhausting me...barefoot in the hammock is having a huge appeal right now.
Thanks to @The Mole and to everyone else for their fascinating input. I've been trying to puzzle this out too.
I did a stress test recently. The great news was that my heart and lungs are fine, even under stress, but the doctor did recommend that I work more often in the 152-157 bpm range to increase my something or other.
In order to do this, I need to run more slowly. But I was starting to feel that I was ridiculous, stepping in place, so I would slow the cadence, then get tired, so I'd speed up the cadence and not be able to resist speeding up the running too...
A vicious circle.
(Q. What's round and dangerous...)