On Antigravitational ER Muscles and Positioned ER Muscles…

In the Myokinematic Restoration course manual what does “Antigravitational ER’s and “Positioned ER’s” mean? 

The Top 3 anti-gravitational external rotators are the muscles that are powerful against gravity.  You want to turn these muscles on when in an anti gravitational position because of their power.  These 3 muscles may or may not be in a correct position but they are powerful when fighting against resistance.

The Top 3 powerful positioned external rotators are the muscles that are the most powerful after they have been “repositioned”.  After you have repositioned the patient’s pelvis, if you want to go after strength and power, you would go after these 3 muscles.

This would be the same for the IR muscles listed.