When my clients walk in to their gyms they see the same things no matter what gym they frequent. For core workouts there are ab wheels, crunch machines, sit-up machines and core classes utilizing different variations of leg raises, crunches and sit-ups. There are so many ab exercise machines in existence that I couldn't begin to count them all. If you type in "abs" on Google you will be inundated with hundreds of ab exercises, ab equipment and ab workouts that claim to give you the "perfect core" or "shredded abs". The other night I saw a commercial on TV for the ab skates. These are skates that attach to your feet and you actually skate your feet back and forth to do reverse crunches, knee curls and many other exercises that are advertised to give you a strong core.