Get into the all-fours position on the floor. Hands should be placed shoulder-width apart with knees and feet hip-width apart. Your hands are flat on the floor and slightly forward from below your shoulders. Keep your head level with your spine and your spine parallel with the floor. Keep your eyes down. As you exhale, drop your head, tuck your tailbone under and hump your back like a very angry cat. Feel your vertebrae separating and your muscles lengthening and releasing. Inhale and return to start position. Repeat five times.