This is a hip opening pose but you must keep the back straight and abdominals engaged so the Cobbler is a good back strengthener.
Bring the soles of the feet together and as close to your groin as possible. Let the knees drop out to the side. I find the hardest part of this pose is to keep the upper body upright and relax the hips at the same time, it seems to be one or the other.Bring your ribs forwards relax the shoulder and open out the chest. Keep the neck long and chin level with the floor.