The PVC drill is a method I like to use when coaching a proper hip hinge. I like to coach this drill because is gives my clients intent feed back. To preform this, place the PVC Pipe on your back and there will be three places of contact, the back of the head, upper back and top of your gluten (sacrum). Once all three points are contacted along the PVC pipe push your hips back while maintaining all three points of contact on the PVC Pipe. If you lose contact with the PVC pipe you are doing the movement incorrectly. For example:
I normally start my clients off with two sets of fifteen reps. You will learn the proper movement quickly because as i mentioned before it gives you instant feedback.