I don't know tbh mate. I think I'm getting there. My resting heart rate is back at 50 now, after a few months of being up near 60...
Running I'm feeling loads better, I'm just not as fit as I was but that can come back. Interval training on the turbo bike is still pretty grim though in that my heart rate will shoot right up to 165-175 range, whereas before it'd be 160s with occasional 170.
haven't been able to get out on the bike much but it was sluggish a few weeks back, but not feeling any general fatigue...
I suppose we'll see if my booster changes that. But hopefully it's just a case of maintaining where I am atm fitness wise over winter and then once spring comes around I can really up it a bit more. there's just some times where I keep absolutely dropping out completely when exercising, like you go to having no energy so quickly and that is definitely something that's stuck around