This is a real practice we ran with our 8 and 9-year-olds. Nothing exotic. Five games stitched together. Every kid moved the entire time. They asked to play it again the next week.
There is no isolated tee work. No isolated long toss. No "everybody field 10 ground balls."
That's intentional. Every minute of this practice has at least one of these three things happening:
That's not a coaching theory. That's how kids actually learn baseball.