Heh, that’s closer to my default state due to CPTSD and I’m quite comfortable/familiar with it.
But choosing to exacerbate that state when there are other options to achieve my fitness goals is counterproductive, and I’ve been advised to avoid it.
There’s an important difference between getting comfortable with hard things, and subjecting yourself to unnecessary/avoidable hyper-arousal states which can become their own form of health problem in the long run.
People injure themselves this way, and should pay attention to their bodies when exercising.