1. A very similar set up to the hip rotation stretch, except instead of twisting your chest towards the front leg, rotate your chest away, so you have the same hand as foot on the floor in front of you.
2. Aim to sink your pelvis down to the floor, and to have a perfectly vertical alignment from the bottom hand, through your arms up towards the top hand.
This is a fabulous stretch for the psoas muscle, which attaches from the lower back down into the groin. The primary action of the psoas is to flex the hip, although when there is pain and dysfunction around the pelvis or lower back, the psoas can begin to act as an inefficient spinal stabilizer and lose its flexibility at the front of the hip.
Stretch out your whole body with the be. Stretching Guide.