Dr. Mark Hom, M.D. is a Johns Hopkins University trained biologist (B.A. in Biology with Honors), an award winning artist (Kenan Award at Johns Hopkins, first place), an award winning medical illustrator while attending medical school at the University of North Carolina (a UNC Dean's grant recipient and also a UNC Holderness Fellowship recipient for illustrating the "Anatomy Lab Manual"), a practicing interventional radiologist (one of the most in demand medical specialties), an educator of young doctors (an Assistant Professor of Radiology), and an avid fitness cyclist (riding 4,000 miles per year). Dr. Hom will explain how the human body, various organ systems, and individual cells function in the biologic process of exercise. Dr. Hom will show that mitochondria are at the center of cell energy production, metabolism, and athletic performance, as well as an underlying cause of degeneration, aging, and many diseases. Optimizing mitochondria not only maximizes performance, but also improves vitality and overall health (a topic usually overlooked in fitness books not written by MD's). Dr. Hom is self-illustrating his book(s) with digital drawing programs and dedicated computer hardware.