This move is my favourite way to relieve tension in the lower back, hips and abdomen. This also opens the chest and shoulders.
Lay down with your back on the floor with your arms stretched out from the midline of your body. Draw the right foot as you bend the knee and place foot next to left knee of straight leg. Rotate the right knee towards the floor. Turn the head to fast the left hand. Squeeze the abdomen into the back and breath as you hold the posture. Unravel, stretch your leg out and repeat with left leg.