Stand on one side of the foot, knee, bent handles, feet, heels, buttocks, knee affixed. If it cannot be stabilized, either on the spot or one point of view may be the Chair backrest island.
Stand on one foot, bend the knees to the toes, heel stick handles, buttocks, knees close together can not be sustained if it is a match point. Koh chair or backrest.
Stand on one foot, knee, handle toe heels to the buttocks, knees together, if you can not stand to look at one point or another. Or maybe the chair backrest.