Unrelated to that. I'm thinking you must be pretty damn fit.
You seem to do quite a bit of mileage off road, and fairly regularly. Gotta mount up, especially miles done in the mud.
I'm not too bad at the moment and managing to stay injury-free. I've been biking as much as possible since last spring after a very lazy (and fattening) winter. I'm lucky that I finish work at 4:30pm (3:30pm on Fridays) so can squeeze a good ride in after work during the whole of BST and generally try to get out at least once at weekends too. When BST ended last month I started taking two afternoons off a week (picking the best weather where possible) to fit two good midweek rides in during daylight. I planned it so I can do this until Christmas. I'll tend to do more weekly mileage in the summer but the muddy winter miles are much better value. There's nothing like sticky mud to get them legs burning..! I'm averaging between 38 and 43 miles on typical rides at the moment but 14 of those are to/from the woods on hilly singletrack, bike paths and lanes, so only about 24-29 miles are properly off-road, and only small sections of that are in proper mud. The trails drain pretty well around here. This is pretty typical terrain when it's wet:
You're right though, it does mount up. On non-biking days I'll do around 90 minutes on the cross trainer (in front of a film so it doesn't feel like work) so I am probably the fittest I've been for decades right now. Well, bike fit, anyway. As a teenager I lived in the Transvaal for three years, about 6,000ft above sea level. I played rugby, swam and ran cross country for the school (sport was done every afternoon and on Saturdays over there, not just in a 'games lesson' once a week like over here) so I basically had three years of quite intense altitude training. When we moved back to the UK living at sea level again I was superhuman compared to the local kids..!
Edit: plus, I've noticed a definite increase in energy levels since having green Nutriblasts for lunch instead of the usual stodgy crap I used to eat.
My favourite review of the Nutribullet. (Mine is the newer 900w version. Much better, no leaks, 25,000 rpm, bigger cups).