br Dear Athletic Strength and Movement Enthusiast, br br You probably understand the importance of the posterior chain by now – that series moving and stabilizing muscles up and down your back side including but not limited to your butt. You probably know that sitting too much “numbs” this all-important set of muscles and is essentially a huge “hole” in the back of your body. br br If you sit around and don’t do anything this might not be a problem. But if you have decided to use your body for sport and movement – you probably know that “posterior chain amnesia” is a very big, potentially catastrophic problem.