We've hit that point, the part of the Hatha Yoga Pradipika where we learn about "posture." The word "Asana" means "seat" or "pose." Consider this; 3000 years ago people weren't sitting in chairs at desks or driving around in cars. They were squatting, sitting on the ground, moving along the earth on their own two feet and taking a seat wherever they needed.
In the Yoga Sutra we are taught "Sthira Sukham Asanam;" to take an easy, steady seat. The same is true in Hatha Yoga. In order to quiet our mind, slow our breath and focus inward, we must have steadiness of body. No matter what pose we choose to take, if that posture remains steady, easy and balanced, we will be able to maintain focus.
Tight walkers, slack-liners, acrobats, gymnasts, etc. all have the ability to remain balanced, steady and focused in order to maintain their pose. In Yoga, rather than posing to perform, we are posing to turn within.
As you practice, look not upon how your posture looks but, instead, look within and feel the pose change you.