Glutes Butt Blaster
Lie on your front on a step box / bench, wrapping your arms underneath in order to pull yourself tight onto the bench, to help protect your back.
With your legs extending back, grasp a suitable sized Swiss Ball, between your feet, lifting the ball 6 - 10 inches off the floor, using the muscles of your glutes / butt.
Smoothly raise the ball a further 6 - 10 inches in a slow controlled motion, focusing on keeping your legs straight, using the muscles of your glutes to lift and lower your legs.
If you feel any discomfort at anytime, stop immediately.
An excellent exercise for working both the glutes and lower back muscles, to help firm up your butt.