Maintaining a forward-facing belly button during certain yoga and Pilates poses generates anti-rotation forces that provide stability for the spine.

“This is also what you're going to experience if you ever take a yoga class and you do a pose where you know it's arms overhead Like a Warrior 2 pose or a warrior one pose and they'll say make sure that your belly button is facing completely forward that you're not twisting to the side too much this is also what the instructor will tell you in a Pilates or a yoga class very often in certain movements where there's a tendency to kind of um relax or sag into a twisted upper torso”