According to the present girdle 1, when a wearer walks and a leg is moved backward, a forward load is applied to gluteus maximus muscle by a first tightening portion. Then, a reflective action of a muscle (muscle stimulation) to resist this load acts on the gluteus maximus muscle, and then the leg is moved further backward, resulting in a wearer's waist being twisted backward greatly. Further, a forward load is applied to elevated gluteus medius muscle by this backward waist twisting by a second...