This is the description from the Gray Institute:
The hip is a very powerful region of the human body, when it works well we appreciate its power. When it’s restricted, we feel its loss of transformation and subsequent compensation. On one end, due to the hip region being so powerful it can adaptively get ‘tight” and eventually stiff by exercising more than resting/recovering. On the other end if we live a more sedentary life especially prolonged sitting, the hip region becomes adaptively tight and eventually chronically stiff. This lack of balance (too much movement or too little movement) can lead to many compensations most commonly low back pain, knee dysfunction and/or overall loss of daily function (picking up objects from ground, getting in and out of car, etc.). This can be simplified as an energy leak in the power center causing compensation or symptoms elsewhere. To help balance this very important power center, please join the Gray Institute to learn a very powerful technique to unlock the commonly locked hip region. You will feel the results immediately!Here is a previous post I made Warming up runners through three planes of motion that has an embedded video of Gary Gray of the Gray Instittue addressing the issue of hip tightness He completely explains all motions of the Hip Joint and how the different motions interact. He talks about how tightness of the hip capsules can restrict motion in all three planes of motion and begins mentioning how to address restrictions of the femur in the hip capsule which can create body disfunctions and bad motions throughout the body.