On a hard floor, place the balls of your feet on a towel or sliders and come into a plank position. Align your wrists under your shoulders, with your hands spread shoulder-width apart. Your spine should be neutral.
Keeping your legs as straight as possible, begin to lift your hips up on a four-count tempo coming into a pike. Your arms and shoulders should not move.
Return to the starting position with the same four-count tempo. This counts as one rep.