Pick out two people to be the “chasers” and two to be the “chasees”. Have everyone else line up like a grid with 3 feet in between the person in front, behind to the left and right of them, like this diagram here:
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Everyone should bring out their hands facing one direction to create”streets” in one direction like this diagram:
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Whenever the facilitator calls “streets”, people should lift their arms to create these streets. Then when they call out “Alleys” they should spin 90 degrees to create “alleys” like this diagram:
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Practice a few times until people understand, then set the “chasees” out amongst the streets. Give them a 10-second head start then send the “chasers” out to catch them. Systematically switch from “streets” to “alleys” until the two get caught.