How Does Muscle Memory Work?
What Is Muscle Memory?
How It Works
They are quite large and one of the few multi nuclear(have more than one nucleus per cell) cells in our bodies.
When you load your muscles with training, new nuclei are added to the muscle cells, which allows they them to grow larger in size. When nuclei are added they make the muscles larger and muscle fibers also begin to grow in size.
Upon detraining(not training) those muscle fibers are resistant (with stand) to atrophy (disuse) thanks to the increased amount of nuclei.
Some time later when training is resumed, the muscles rapidly grow in size because the step of adding nuclei is "skipped." Because they are already there, ready to combine muscle proteins again, rapidly increasing muscle size.
This is why retraining is easier than the first training you performed by those with no previous training history.
Here is a little easier way of explaining it .When you teach your body how to do something physical, it creates a "blueprint". Even if you take some time off, you'll get back to where you were faster than it took you to learn the exercise in the first place. This process comes from your body's learning not just how to perform a task, but also how to break down muscle tissue and then repair and rebuild it.
This process starts in the brain, When you move, you activate proprioceptors (sensors) in your muscles, tendons, and joints that constantly give feedback to your central nervous system about where your body is in space, so it knows what muscles to fire next, it's a continuous feedback loop from your brain to your muscles and back. Your brain creates pathways through your central nervous system, and movements become automatic. Those well-worn pathways essentially become your muscle memory. The more you do this certain activity, the more your brain remembers!