How to: Roll up a towel and place it under the bottom third of your shoulder blades, then like back with knees bent to 90 degrees, feet flat (a). (dailyburn.com)
Lie on back with knees bent, a 5 - to 8 - pound dumbbell in right hand lifted so weight is over shoulder. (health.com)
Rock forward and back with knee pull: Start on your hands and knees with your right leg extended in natural arabesque. (health.com)