Wonder Core Twist is the brand-new version of Wonder Core Smart with a 360-degree built-in rotating seat. The revolutionary fitness solution takes your Core workouts to a whole new level! With the built-in twist seat, it's like doing 3 workouts, Crunch, Leg Lift and Twist at the same time. Reinforce your core strength with 8 plus 5 twist training. Build up Your Ultimate body faster and ever!