When discussing the high intensity training philosophy with new clients, I often hear: “This is so different from what I’ve been told regarding fitness”. Even our current clients who have obviously seen the changes happening but can’t quite seem to rationalize them make this comment. The intent of this chapter is to show how “mainstream” fitness publications, such as college textbooks, and other articles actually support the HIT philosophy. When I was in school, I thoroughly enjoyed and excelled in such subjects as anatomy and physiology, kinesiology, and exercise physiology and I always felt a step ahead of most of the other students because I was already well versed in all the information from reading old Nautilus materials.. . .