This Is the Most Important Muscle in Extended Side-Angle Pose—and How to Find It. This asana helps you connect with your primordial power by strengthening the deep muscles of the legs and pelvis. The post This Is the Most Important Muscle in Extended Side-Angle Pose—and How to Find It. appeared first on Yoga Journal. Previous Article Opting Out of Headstand? These 5 Poses Help Mimic Its Effects. Next Article What the Full Moon in Scorpio Means for You