Begin by standing tall with feet shoulder width apart. Bend over from the hips and touch the floor with your palms flat on the floor. Keep your legs straight as you walk your hands as far forward as you can until you are in a high plank position. Keep your core braced throughout and do not let your hips drop. Pause in this position and then reverse the movement by moving your hands back towards you feet until you are once again standing tall. Continue for the required number of reps (or time).