In this article, I review a very popular product for fitness trainers, and some new products that are being developed and marketed. Why is this article important? Because most people who buy products will never change their lifestyle, and instead continue to exercise the same way, regardless of whether it works for them. That's not right! This article is intended to educate those who are concerned about the quality of the products they buy. What do you need to know? This article reviews various products for fitness trainers, that are either sold online or in a store. What are these products? The products reviewed here are designed to assist in the training of the core. Why should you use these products? In general, these products will help you maintain optimal core strength, minimize injury, and improve overall fitness. These products are recommended by many of the world's best trainers, who have used them for decades, in order to help improve their ability to effectively train the core. What is "core"? The "core" is the part of your body that is responsible for maintaining a stable posture, with the lower back at the center of the body. It helps the spine stay straight.