It's certainly not for mere mortals.Collapsed lung, AF, broken ankle, ... HAMR should carry a health warning ...
Kurt's (normal) riding heart rate is phenomenally low, though. I'm not sure he actively uses his heart rate as a guide to how fast he should be going in the same way that Steve suggests he does, but for the most part Kurt's HR has been around 80-100 bpm, like Steve's has.Am I right in thinking (without having read the link ) that Steve is less likely to suffer from these issues, as he is riding to a HRM and thus not really straining himself - or his heart, at any rate - nearly as much ?