JJ holds a Ph.D. in Exercise Physiology and is a registered dietitian (RD). He is an associate professor and has published close to 50 articles in lay and scientific journals regarding various aspects of fitness and nutrition. Also, Dr. Mayo has been quoted in magazines such as Men's Health and US Weekly. He is an active member of the American College of Sports Medicine, the National Strength and Conditioning Association and the Academy of Nutrition and Dietetics. JJ is an avid exerciser who has competed in marathons, ultramarathons, and triathlons for over 15 years. He is a Boston Marathon Qualifier and has completed 10 Ironman triathlons.