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When you played sandlot baseball, how much moving around did you do? Compared to 3-on-3?
I'm not sure baseball should be the preferred way for kids to get their "60". For me, sandlot baseball was closer to badminton than hoops. Ball comes your way 1/6th of the time on D; on offense it's even worse.
Baseball practice never compared to basketball practice or football practice, either. Well, unless you were the catcher :- )