Shifts

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Is it a shift when offensive lineman go from a two point stance to a three point stance? They have their elbows on their knees, the Qb says down and the linemen then put their hand on the ground. And if it is a shift where is this specifically in the rule book. The rule book says you have to move to anew position. is that "moving." And is that a new position. I thought it meant you have to change positions on the field. And when this happens does a running back have to wait for those linemen to be set a second before he goes in motion. Thank you.