Start: Lie with a rolled towel directly under your spine, supported from tailbone to head. Your feet are hip width apart, with hips, knees and ankles aligned.
Movement: Place one hand over your lower abdomen and raise the other arm towards the ceiling. Breathing normally, stretch the arm overhead, allowing the spine to relax and lengthen, and your abdominal wall to drop away from your other hand. Float the arm back up to the start position.