There is no shortage of articles about abdominal training, and the fitness industry will continue to pump out those machines for commercial gyms n high-energy ab raining videos for home workouts. Although there is no shortage of exercises, their value ranges from relativity worthless, such as crunches, to the potentially dangerous, such as Roman chair sit-ups. There are also exercises that are do advanced that they can easily result in injury to beginners. So what do you do?