The Shake Weight pro is the revolutionary new way to work out the muscles in your upper body-biceps, triceps, shoulders, and chest using Dynamic Inertia. Its distinct motion makes the Shake Weight Pro the first product of its kind specifically designed to help men achieve toned, sculpted arms while eliminating flab. Inertia is defined as "The tendency of a body in motion to remain in motion unless acted upon by an outside force". Dynamic Inertia uses these basic principles in a unique way to create multi-directional resistance. If you don't have a lot of time to devote to exercise, then this Shake Weight is perfect for use. It only takes 6 minutes a day. You will receive a training video to help you through this exercise showing you how to properly use the Shake weight. No time to waste, get your's now and get started!!!!!!!!!