There are many methods to grow a bigger back. One of the easiest methods, that is often overlooked is - focusing on the stretch. On the release of the exercise, allow the weight to pull your back into a full forward stretch to get the most out of your workout.
Jenna gives you hip abductor exercises to prevent injury and improve strength. Make this weakness a strength by adding this to your workout regiment.
Working antagonist muscles to reach hypertrophy. Supersets are a great way to end any workout and fully exhaust the muscles. Muscle failure should be a tool used sparingly . . . should not be done all the time.