The gluteus medius plays an important role in stabilizing the pelvis. It helps manage very good alignment of your hips and knees with unilateral actions for example stepping forward, walking up or down stairs, and lunging. Also called Seated Pigeon Pose, the seated figure-four extend helps loosen up your glutes https://www.theorthopaedicandpainpractice.com/lower-back-and-buttock-pain/