how to perform the plank the right way

So this is something I see a lot in the fitness industry. Planks being performed incorrectly, even when taught by personal trainers. People's posture is all wrong, either their ass is too high in the air, meaning they get very little benefit from the movement or their hips are sagging in the middle, putting a great deal of pressure on the lumbar spine.
In the video I share with you a great little adjustment, where you can really target your abs and improve your strength and stability in the plank position.
WARNING! THIS WILL CAUSE YOUR ABS TO WORK VERY HARD