From Downward Facing Dog, step your right foot in between your hands and stay on the ball of your back foot coming into Low Lunge. Lengthen the spine and come up onto your fingertips. Make sure your right knee stacks directly over your right ankle. Extend your arms out toward the front of your mat, parallel to each other with palms facing in. Slightly shift your torso to the right so your navel is in the middle of your right thigh. Take a deep breath in. On the exhale, shift your weight into your right foot. Slowly start to straighten the right leg as you lift the left leg up behind you. Stretch your arms forward, while keeping your gaze down, or slightly forward. Flex your back foot and internally rotate the inner left thigh so that the toes point down towards your mat, not out to the side. Lower or raise the left leg so that it is parallel to your mat and your hips are in line.
Try to hold this pose for about 30 seconds and then repeat on the other side!