The Coastal (Ab Coaster) machine is an effective abdominal workout device that targets the core using a unique bottom-up motion, helping you strengthen the lower abs without putting pressure on the neck or back. It features a kneeling seat and a curved track that allows you to pull your body upward using your abdominal muscles only, providing excellent training for the lower abs, upper abs, and obliques when you twist to the sides. The machine also allows you to add weight plates for increased resistance, enhancing results. Overall, the Coastal/Ab Coaster machine is safe, stable, and highly effective for building a strong core and achieving six-pack abs.