I teach MMA. I specialize in BJJ. When I’m showing someone a technique, I show them the proper way. They then do the move, and most times they get 90% of it right but have to keep working on that last %10. If they just practice that over and over at %90 it’ll never be good. They need someone there correcting it, until they perfect it. Once you perfect it, you expect the same outcome over and over from the same thing. That is muscle memory.