Vic Lamonda uses this, as many others do, in his Broadway Dance class at Alvin Ailey Dance Center.
Stand with legs shoulder width apart. Place the palms of your hand on your hipbones. Thrust your ribcage forward in one controlled motion, while keeping everything else steady. Go back to center. Repeat three times, for four total repetitions. Now thrust your ribcage backward. Repeat three times. Do the same for each side. Repeat three times. Now circle clockwise four times using all four positions. Do the same counterclockwise.
Disclaimer: None of the above information can be taken as a substitute for advice from a medical professional such as a physician.
My third book, Pocket Guide to Fitness, is available on www.louizapatsis.com, http://www.authorhouse.com, www.bn.com and http://www.amazon.com. If you look up my name on those Web sites, you will find my other books The Boy in a Wheelchair and Life, Work and Play: Poems and Short Stories.