Took up mountain biking a year ago and there's this race in December  - the McDowell 60, with 9k foot of climbing and, you guessed it, 60 miles of desert terrain to be travailed - which I've foolishly entered.

Began training in earnest earlier this month, and started taking cordyceps, a Tibetan fungi believed to enhance heart health and VO2 max. That and fish oil.

I used to have a resting heart rate of around 55 beats per minute, I think - maybe a little less.

Yesterday morning I checked upon waking and it was 41 beats per minute.

Seems a bit extreme, actually.