We’ve all done something repetitive that we were able to do without thinking about it. Rather than use what I deem as glib a description as muscle memory, of an innate human ability to adapt movement to the responses of the nervous system, I call it either The Flow or doing God’s work. I.e. there was no ‘me’ involved.
In meditation this is achieved too. The indication that you joined this flow is that time compresses.
Alone - All One 