Because hinging at the hip puts the gluteus maximus (the biggest part of the bum) into a stretch. Once you move the external resistance, the glutes contract, providing a mechanical stress. Performing the hip-hinge is a great way to build the gluteus muscles, giving you a nice booty. It is now clear why everyone, no matter what training goals, should perform the hip-hinge with you Pasadena Personal Trainer. It’s one of the best bang-for-your-buck movements on the market and has numerous of variations in case you get bored of the same exercise. So go pick up something heavy off the floor and put it back down!