The ceiling of Principal Aleicha Ostler’s office in School 19 often vibrates, as small feet clamor and stomp above her head.

Ostler’s office isn’t below the gym or a busy hallway, but the classroom above her is seldom quiet. That’s because nearly every class at School 19 has physical activity built into the day, with students walking, dancing and stomping as they study English, math and history.

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