Credentials & Experience To call yourself a Personal Trainer you must have a certification from a nationally accredited organization. Some of these include The National Association of Sports Medicine (NASM), The American Council on Exercise (ACE) and the International Sports Sciences Association (ISSA), to name a few. In order for trainers to obtain these certifications, they must pass an exam that covers exercise physiology, anatomy, nutrition, and weight management. They must also be CPR certified in order to take the exam and obtain a certain number of continuing education hours per year to keep their certification up to date. A trainer should never hesitate to show you their credentials.