To perform a band good morning, stand on the inside of a band lying on the floor. Take the opposite end and put it across your band and hold onto it with your hands so it doesn't fly off. Stick your glutes back and with your lower back tight bend forward till you are about parallel with the floor. Good mornings are a great way to build glutes and hamstring strength and will greatly help your deadlift lockouts and teach you to stay more upright while squatting.
Band Good Mornings Lower Back Exercise - Start Position
Band Good Mornings Lower Back Exercise - Finish Position