Suspension Bridge

The movement will help you develop gluteal muscles, which can perk it up and tone the said area. It is a simple movement, but it will require you to do it in a controlled fashion.
Lay yourself down flat on the floor, and insert both of your feet inside the handles.
Make sure that your shins are directly parallel to the ground before you initiate the rep.
Use your hips to lift up your body as high as you can, and lower it down slowly.
Repeat until you finished the desired reps.