Parivrittaikapada Sirsasana (Revolved Split-Legged Headstand) registers as 10* on the 60* scale of difficulty.
In Parivrittaikapada Sirsasana, you have to pay great attention to parts of your body that you can’t see within the pose. Many practitioners (including me) tend to reach their front leg closer to the ground than their back leg. Drawing the back leg closer to the ground requires great flexibility and openness in the side body and hip flexor of the back leg. It can be easy and hypnotizing to focus on the journey of your front foot lowering closer to the earth; but, this comes at the price of balance and evenness within the asana.
Channeling your attention toward the invisible back leg requires keen awareness of the dynamics of your body. And that keen awareness must be maintained while you’re upside down! Not a simple task!
Begin by playing with Parsva Sirsasana and by exploring a split-legged Sirsasana that isn’t revolved. Within each of these poses, sharpen your awareness of the balance between your front body and your back body. In Parsva Sirsasana, examine the point at which you begin to arch your back too heavily. In split-legged Sirsasana, isolate the moment when both legs are equally close to the ground. By establishing your center point in these poses, you can approach the twist with equal consideration to the front and back body.
Check Â this wonderful article in Yoga Journal, written by Colleen Saidman and Rodney Yee, on thoughtful sequencing to move towards Parivrittaikapada Sirsasana.