What plan is this? I was trying to see what the overall plan looks like, and can’t see any low-volume build plan with Kaweah and Ansel Adams. Ansel Adams is brutal, 6x6 sets of 50-seconds at 130% of FTP and 50 seconds recovery? Yuck.
Anyway - first, a bit a tough love here. Lots of workouts have tough parts. All athletes feel like bailing during tough workouts. ALL ATHLETES. So feeling like you want to bail on a workout – that’s always a temptation. Part of training is learning how to mentality deal with the discomfort.
Every time you bail on a workout, you’re a little more likely to bail on the next one…and the next one…etc.
Now – obviously if you can honestly say you’re really really done, get off the bike – but I’d say 99% of the time, that’s not the case. You’re in a tough workout and you want to stop. Kaweah, IIRC, is like 10-12mn intervals basically at FTP – yeah, that’s going to hurt.
Do whatever you can to get through a workout. Back-pedal for 30 seconds, maybe turn the intensity down 5%. Getting through the workout will make it that much easier to get through the next one…and the next one…
I’d also say - ignore heart rate. It can be higher – or lower – for any number of reasons, and you don’t want to convince yourself that your higher HR is a sign you’re fatigued. Maybe it’s higher because you’re tired. Or dehydrated. Or it’s warm. Or you’re fitter. I know that I’m getting fitter when I can get my HR higher during max efforts! What if I stopped when my HR got higher than normal because I was telling myself “I’m fatigued” instead of “I’m in the middle of a breakout performance”?
Ultimately you have to listen to your body - if you need a break, take a break, the bike will still be there.
But be honest with yourself, and make sure you’re not taking the easy way out (lord knows we’ve all been there…!) But all else equal - we don’t know what else is going on with your life (stress? lack of sleep? moving house? etc.) - week three of a low-volume plan simply doesn’t seem like a likely candidate for full-on fatigue.