Level
You have already trained your fingers in all sorts of ways. For example, by moving a short fragment one key at a time.
5
You have already trained your fingers in all sorts of ways. For example, by moving a short fragment one key at a time.
Now try that with 3 fingers. You can do that in 3 ways, with 123, or with 234, or even with 345. And then you can also go back and forth. Or with 2 hands at the same time.
There are really many different ways to train your fingers!