From the TRX Page: "This is a fantastic hip dominant exercise Dewey picked up from Dr. Stuart McGill a couple years ago. Since there is a low load on the spine, this would be a great option for clients and athletes who are intolerant to traditional squats and deadlifts. One consideration before programming this exercise is the athlete must demonstrate adequate hip mobility and core stability to hold the correct position and then be able to move while in it. The key is to think “spread the chest” and “push the butt out.” Yes, they’re funny coaching cues, and yes, you will feel a bit funny the first time you do this."