When you rotate your trunk while playing tennis, golf, baseball, hockey, cricket, polo, surfing, or snowboarding, the torsion of the pelvis is hard to avoid. Your pelvis is pulled out of a healthy neutral position by a tight Hip Flexor…

The animation isn’t perfect but hopefully you get the picture. Imagine the left side of your body is or is attached to a flexible rubber torsion bar. By imagining the center of rotation is the left side of the body…