muscle memory

This term describes the subconscious mastery of a physical skill. While it suggests that the memory resides within the muscles themselves, it actually refers to the neurological pathways in the brain and spinal cord that have been reinforced through repetition. It is commonly used in sports, music, and technical crafts to describe the transition from conscious effort to automatic execution.

In a linguistic sense, the term is treated as an uncountable mass noun. You would not refer to "three muscle memories" when discussing different skills; instead, you would describe the development of muscle memory for a specific task or the presence of muscle memory in general.