Have you considered training older adults? According to the United States Census Bureau report, more than 40 million Americans are age 65 or older. That’s a huge potential market for your health and fitness services. Senior exercise information, senior fitness education and advanced senior fitness qualification from the American Senior Fitness Association. Your source for exercise, aging and wellness resources for exercise instructors older adults and the program developers who serve them. Fit Forever Do you want to get fit and stay fit? This low-impact class will help you improve your aerobic fitness and your strength. SilverSneakers® Classic.