You're not limited to simple floor exercises when it comes to working your abs, back and hips. If you're ready for a change from planks and crunches, try this cable machine move called the Pallof press. Basically, you set up a cable machine with the handle at chest height, and then you grab the handle and sidestep away from the machine. You're now resisting a weight that's trying to pull you sideways. That means you have to engage muscles throughout your back, shoulders, abs and hips.
The "press" part comes in when you add some motion. You can push the handle away from you, or you can take the move vertical and try to push it up over your head. Both versions make your body work even harder to stabilise your core as the direction of the tension changes. To complete your workout, turn around and do another set on the opposite side.
Amazing Exercise for Your Core: The Pallof Press [Yuri Elkaim]