The Freak Athlete ABX Sit-up Attachment isan attachment designed exclusively for theABX Weight Bench. By attaching it to the bench, you can safely perform abdominal exercises, including decline sit-ups. The leg rollers feature two-stage adjustment, allowing you to customize the fit to your physique and preferences. It can also be easily attached and detached with a one-touch mechanism. The weight capacity is approximately 227kg (500lbs).