@SOC How long did it take you to train yourself? I'm a few months in, yet still can't get the hang of it. On really good days I stay well below my estimated AT, on really bad crash days my HR climbs very rapidly and I can't do much of anything but hit the bed. And the remainder of days are somewhere in between, but I can't yet predict. Is this due to my POTS not being adequately treated? Or is this just par for the ME/CFS course?