There seems to be a close link between energy levels, belief in ones ability to achieve ones goals, and confidence.
It seems to me like this might be tangled up in the whole thing where (IIRC) the feeling of tiredness/fatigue/”whole-body burn” during exercise is generally not because your muscles really are giving out or you’re about to damage yourself, but because your brain doesn’t think that the risk of harm and very certain tiredness and vulnerability are worth it. It even points towards why depressed people (among others) tend not to enjoy exercise as much and often give up earlier or do less, even if they benefit from it just as much.
It seems to me like this might be tangled up in the whole thing where (IIRC) the feeling of tiredness/fatigue/”whole-body burn” during exercise is generally not because your muscles really are giving out or you’re about to damage yourself, but because your brain doesn’t think that the risk of harm and very certain tiredness and vulnerability are worth it. It even points towards why depressed people (among others) tend not to enjoy exercise as much and often give up earlier or do less, even if they benefit from it just as much.