It's an age thing Brushy. Not so much about performance but ability to recover from pushing ones self. You race twice or more in one day on a regular basis but at almost 55 I would find that impossible. I'd even consider Zwift as an addition to Bkool if it weren't for that, but only have the energy for one of them.
Recovery and age can be strange things.
When I quit work at 58, I started riding much more frequently and longer distances. I'd be riding 200 miles plus a week. My endurance and speed seemed seemed to build up over time, although not without some days of feeling completely done-in.
Last year, I was smashing out Strava PRs and rode around 350 miles over 4 days to Mont St Michel and back with a group, with some tough, wet and windy weather on days 1 and 2. I only really felt any tiredness on Day 4.
And then came the return to Bkool, which continues to frustrate me. I certainly seem to find it tougher to recover from hard rides and like many others, I find days where my power and speed don't really make sense.
I re-rode CG1 solo on Monday and took around 5 minutes off my previous time with an average of around 250W. Obviously. I was happy with that, so next day I rode a similarly flat stage or roughy the same length on BWC, and I'm 50 watts down from the previous day, although it feels like I put in a similar effort.
How much this is down to recovery, and how much its down to Bkool I have no idea.
I did admit to my wife, as I was boring her to death with my power stats, that it may be down to the fact that I'm now 62........., but I'm not having that!!