1. Start on your hands and knees, the palms of your hands flat on the floor underneath your shoulders.
2. Slowly push your shoulder blades as far apart as possible by lifting your upper back towards the ceiling.
3. Keep your arms straight as you slowly lower your back about 1 inch (2.5cm) by bringing your shoulder blades together.
4. Slowly return to the starting position.
5. Repeat for the desired number of repetitions.