The plank exercise is very similar to a pushup exercise move. It comes from making your body straight as a board (plank of wood). The position is face-down on t

The plank exercise is very similar to a pushup exercise move. It comes from making your body straight as a board (plank of wood). The position is face-down on the ground, with all of your weight supported by your toes and forearms. It is generally difficult to hold that position in proper form for long periods of time (or at least your muscles start to ache)