This exercise is similar to one that gives football players the swivel hips that enable them to elude the grasp of enemy tacklers. It is the first exercise designed and demonstrated by Bonnie Prudden which involves moving from one place to another. An agility exercise, it is also good for muscles in the waist, hips and legs. Perform it in time to a lively phonograph record with a fast beat.
This is an article from the Sept. 30, 1957 issue
Step forward on the right foot, turning your entire leg, hip and foot inward. Keep the upper body straight, and twist the arms toward the turned-in leg. Then repeat in the opposite direction. After a while the movement will flow, and you won't have to think about it. Continue across the floor and back.