The Bodyblade® is the simplest core-strengthening tool you will ever use. When in use, the blade bows back and forth at a rate of 270 contractions at 4.5 hz, which is based on Newton’s Laws of Inertia to most-effectively contract and release your muscles. The Bodyblade Classic is designed for the majority of users, while the CXT is for those rehabilitating injuries or for seniors, and the Pro is for more advanced users. The Bodyblade is useful for anyone looking to for a small but extremely effective core strengthening or rehabilitation tool to us at home or at the office. -Improve spinal stability, proprioception, muscle endurance and cardiovascular fitness.-Enhance muscle power, coordination and overall performance in sport and exercise -Suited for use by world-class athletes or rehabilitation patients