With their understanding of how muscles work as well as the need for the neurological system in conjunction with movement, they combined weight training, stretching, balancing, and agility work. The only way to try this is in their book ProBodX (Copyright 2003) and their respective websites. They take four factors that highly involve the central nervous system. These factors are: V6 engine Visual inspection is easy to find, if it is a gas pipe that breaks down to see if there is gasoline in the ground.