The invention provides an exercise device (10) comprising an elongate member (20) and an engagement member (30) having an engagement region (40), the engagement member defining an aperture (35) therethrough, the elongate member extending through the aperture, such that when the engagement region is under substantially no load, the engagement member is slideable along the elongate member and when the engagement region is placed under load, the engagement member is substantially non-slideable along the elongate member. Also provided is a method of pelvic realignment involving use of said exercise device.