Resistance Bands are useful by themselves or when used in conjunction with free weights. They allow the lifter to focus resistance within a specific Range of Motion. The Bodyforce X9 uses a carriage system where lifting handles, footplates, etc can be attached to perform a host of exercises. Bodyforce is one of the first on the market to mate bands with this type of lifting hardware, giving you one more great way to target muscles and muscle groups within a specific range of motion.