In reply to elsewhere:
Thanks for the heads up.
When I first tuned in, about 20 minutes in, I thought, obviously this is going to be boring to watch, he's just going around in circles at pretty much the same speed on his own. I'll just watch a couple of minutes then go to bed.
40 minutes later I'm still watching. And, in fact, watching him gingerly get off the bike and need support to walk! The commentators kept using the word "brutal". I can't think of a better word. It was definitely helpful to have both Alex's and their description of how he must be feeling at various points as, otherwise, Alex was doing a great job of looking good throughout (to a lay person).
Fantastic effort, and some backstory and motivation I didn't really know about.