When talking about the bridge, you probably would have imagined something different. The full bridge requires a lot of work though and should be acquired slowly. This simple bridge is a good exercise to start with and very beneficial for the back.

How to: Lay down on the floor and place your feet in an upright position.  Place your hands next to your body since this will give you extra support for the balance. You then move up your bottom from the ground, hold it for a breath and then lowering it again. I recommend to start with 1 set of 15 repetitions. When you advance, you might add more reps or even another set or two.

Information retrieved from Liebscher-Bracht.