That difference is like comparing taking a piss and having sex. While you use the same body part the experiences are not at all alike.
It's like having sex after a whole day of sex work. Exhausting.
From what I am seeing around me though, reading for pleasure or even to gain knowledge has decreased a lot. I noticed it in adults first and this is being reflected in their children.
Just rip the bandaid off. Get over the inertia of doing the task. You won't injure yourself reading a damn book.