The Rip trainer by TRX has become a staple in my client workouts. When the objective is to strengthen the core I typically think of various ways you need to brace the spine against resistance. I never did much in regards to asymmetrical loads to the body. The Rip trainer makes this easy to do. Today I perform a chest press while maintaining a neutral spine with the Rip trainer. Chest & core in a single movement. Now for the record, the load you're using will be lightened dramatically compared to what you may use on a standard chest press machine, but my argument is that you should only be using a load for chest presses that you can use while stabilizing your spine anyway. My goal is to build for "Go", not just for "Show".
Check out this video and tell me what you think.