Strong Medicine. Dr. Chris Hardy is an emerging leader in public health with expertise in nutrition, strength and conditioning, and clinical and preventative medicine. He is a board certified in Occupational and Environmental Medicine and has a unique and extensive background. Marty Gallagher is the author of The Purposeful Primitive and is a highly accomplished fitness writer with over 1,000 published articles. He's also a top level competitor and coach to elite powerlifters such as Kirk Karwoski and Ed Coan, among others.