The neurons in your brain form stronger, more efficient connections for “muscle memory” actions so you can perform those things better than those with weaker connections. Think watching something on very strong vs spotty wifi.
I don’t know the answer to the second part for sure but my theory is when we mentally think through those same motions, we’re actually switching away from the “muscle memory neurons” and transitioning the thinking to our centers of logic and higher thinking in the prefrontal cortex. I.e., moving away from the strong connections to a different location in the brain.
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