- [Narrator] If you're ready for an ab and weight bench with more versatility then you need the 3-in-1 Core Training System. For most, the 3-in-1 Core Training System can be used as an ab bench. You can perform situps and crunches in either the flat or declined position, which makes crunches more difficult. Switching between the flat and declined positions is as simple as pulling the pin, adjusting the bench, and replacing the pin. The Core Trainer's second function is the Ab Arc, which lets you target your abs and obliques for a strong core. To use the Ab Arc, you'll need to attach the handles if they aren't already on the machine. Attaching them is simple, just screw in the pin. Next, you'll have to unlock the foam rollers that hold the feet in place during sit-ups and crunches. Just release the pin, and let the foam rollers slide down. Then position yourself, and begin using the ab arc. You'll be able to track your progress on the Ab Arc with the fitness monitor. This will keep track of your reps and motivate you to take your core strength to new heights. Finally, the third way to use the Core Training System is a weight lifting bench. It provides a sturdy platform for arm and leg exercises such as bicep curls, bent over rows, and more. Having a strong core is crucial for any sport and life in general. The Stamina 3-in-1 Core Training System lets you target your core like never before.