Another way to do it is to do sit ups or walk toward each other (and back) mimicking pulling or pushing each other with this imaginary rope. This teaches you to pay attention to other movements and to choose your response as you wish.
Do the regular squat and add to it rotating your forearms over your head like you are spinning a rope around them opening on the way down and closing on the way up. This will help you learn to relax the shoulders and to move the entire body as one. It is also fun 🙂