Greatist is dedicated to helping you achieve your fitness, health, and happiness goals. But that would be impossible without certified professionals. To that end, we’ve assembled the world’s most comprehensive network of experts in the field of living better. Greatists deserve only the best, so we’ve been careful to select only the most qualified doctors, dieticians/nutritionists, trainers, scientists, athletes, researchers, and professors to help guide you. There’s a whole lot of information out there, and it’s their job to verify the studies, question the sources, test the hypotheses, and offer valuable tips and recommendations from their experience and expertise. Check out their personal Expert Pages for more information on what makes each of them Greatist-Certified Experts.