Ashtavakrasana: A Hand Balancing Pose That Works and Opens the Pelvic Structure and Mildly Rotates the Spine
Here is a photo of a pose where you are working the muscles of the pelvic structure while opening them at the same time. You are also rotating your spine while balancing on your hands. As with all the poses the key is that there should be an element of effortlessness while performing the pose. You are working fairly strongly but you are not overworking and it should look like you are not working hard at all.