Lower Back Extensions
Video: Lower Back Extensions
Lower Back Extensions are a great exercise to strengthen your lower back, and will also work your glutes and hamstrings at the same time. You should do this exercise on the same day as your ab workout.

Lower Back Extensions | Image: fitbie.msn.com
Watch the video above to learn how to do Lower Back Extensions correctly.
Here’s an alternative version of the Lower Back Extension in case you don’t have access to the necessary gym equipment.