Paroxysmal Afib here. I agree with the Op, it seems to improve as I get fitter.
That said, it is a real barrier for me to hard training. One hard ride takes two-three days to recover, if I follow that up with another, I am sure to fall off the afib wagon again.
Ablation booked however, so here is hoping that works.
In answer to the gentleman talking about triggers, that can work, I cut out caffeine (for a while) and a lot of the booze, dropped weight, blood pressure improved with it. Still suffer when pushing it. Dangerously so at times on rides,where you can nearly black out trying to hold a wheel instead of aknowledging my heart is playing up.
Any how, great thread, new to TR, week one of base completed interested to see if I can recover enough between rides to complete the course.