is true that if you've done some amount of mental effort in the day, learning becomes "pretty inefficient"? I could see that being true if you're exhausted, but then doing a workout would also be a problem.
I would say that learning draws from the pool of "mental energy", but working out draws from the pool of "physical energy". Just because your brain is tired, it doesn't mean that your biceps are.
I would say that learning draws from the pool of "mental energy", but working out draws from the pool of "physical energy". Just because your brain is tired, it doesn't mean that your biceps are.