If there's a so-called favorite exercise machine, I'll choose Roc Its various machines. "Using ROX™ technology, equipment makes the user an integral part of the exercise motion by continuously adjusting the position of the user with the movement of the exercise arm. ROX™ technology achieves an exercise movement that results in optimal biomechanical positioning and increased range-of-motion throughout the exercise. This exercise motion mimics the more natural, comfortable, and functional movements of free weight training. Additionally, the rocking movement constantly shifts the user’s center of gravity to impose small, yet appropriate challenges to the core musculature, while maintaining ...