Piriformis self-myofascial release (SMR) is a self-administered soft-tissue treatment for the lower body, usually using a foam roller, lacrosse ball, or other "trigger point" massage tool. By applying pressure strategically to the piriformis muscles in the upper gluteal region, some people find they can cause this often painful and tight muscle to relax or "release." Piriformis SMR is often accompanied by SMR on the iliotibial (IT) band or tensor fascia lata (TFL muscles), or by stretches that target the glutes and hips.