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Summary: How to find the right ball for four square game in this free instructional video from a children's physical education expert.
"Hey, I'm Tom Jones from McMilligan Elementary School on behalf of Expert Village today I'm going to teach you how to play Four Square. The game of Four Square basically revolves around an incredibly bouncy red ball. It's usually eight inches in diameter. Simple experiment will now show you how important the green ball is in Four Square. Exhibit A: a basketball, not very bouncy, not that much fun, oh it's too bad, oh it's not very fun, that sucks. Exhibit B: The Four Square ball, the old bounce, look at that, GREAT!"
eHow Article: How to Choose the Ball for Four Square