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I think you mean "Deliberate Practice".

Here's a relevant post by Andrew Ng, who credits deliberate practice for greatly improving his public speaking.

Deliberate practice and perceptual exposure are the corner stones of effective learning.

They're both based on the premise to consume small parts, how does this work with stories?

People can look at hundreds of math examples in 30min and probably solve a few special parts of problems in 30min.

But how do you do this with stories?

Write 5-10 intros in an hour?

What parts of a story are even small enough to count as deliberate practice when your write them?

Intro, main, outro? Is this like with songs? Are there fills? interludes? breaks?

There's an entire book dedicated to it "Putting Stories to Work"