The Type III muscle fiber that is explained fully in the Lean Hybrid Muscle system does all of the work for you. This system will explain exactly how this neglected muscle fiber behaves like a cross between Type I and Type II fibers to give you the best of both. The science of this system is based on simple biological facts, and they are outlined in a way that you will understand. When you know how the muscular system behaves, it is easier for you to do the right things to get the results you need.