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 E by a first tightening portion 10. Then, a reflective action of a muscle (muscle stimulation) to resist this load acts on the gluteus maximus muscle E, 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 F by this backward waist twisting by a second tightening portion 20, resulting in the waist being twisted forward this time. Then, such a waist twisting motion is enhanced, which necessarily trains the wearer's groups of abdominal muscles, and a shape-up effect of the periphery of abdominal region may be obtained without the wearer performing intentional exercises.