It may be the butt of many a joke, but the gluteus maximus is no joke at all. You’re about to find out why it’s really “All About That Bass” (no treble). The gluteus maximus is a large muscle that spans all the way across the buttocks from the hips. It is the main extensor muscle of the hip. Without the gluteus maximus, we would not be able to stand erect, walk, run, squat—or ... Continue Reading