I thought about this about falling. Kids do fall all the time, but instead of anticipating failure, they go all in for "success" (whatever success can be for a kid). More momentum is created, diffusing energy in a smoother way. The mindset shutting down the brain for the "negative" aspects of the situation, because it came from a desire not from fear.

I have similar thoughts when playing music, whenever I get a nice sound, I don't feel pain or exhaustion, but every time I fail it suddenly become tiresome.

The brain as an amplifier ?