As with all our stretches be sure you are familiar with the beginning process of stretching. To ensure no injury is caused read this post if you have not already.
Sitting on a chair place your left ankle on top of your right knee. Be tall through the pelvis and elongate through the spine, reaching up through the top of your head.
Leaning forward at the hips while keeping your back strait and tall, gently hug your knees to your chest. Feel the line of pull in your legs or hips.
For easier balance place your floor foot slightly in front of your knee. Do both sides, right and left. For additional stretch gently press the elevated knee down toward the floor.