When you train with weights - not only do your muscles get bigger/stronger, your central nervous system also becomes more efficient at performing the exercises and performing the movement pattern.
There are no exercises to train the CNS or anything like that. Just by lifting weights, you are training your CNS.
Your body basically just becomes more efficient at doing the movement pattern of the exercise. It's similar to how the first time you throw a fast ball. The first time it feels awkward but do it 100000 times and it's second nature