SUPOW(TM) Ab Armrest Abdominal Trainer/Six Pack Care Abdominal Machine/Twister AB Rocket Abdominal Trainer For Crunch & Sit-up Excercise Crunch & Sit-up Exercise Abdominal Excercise Abdominal chair designed to work upper abs, lower abs, and obliques Backrest includes padded massage rollers that pivot with your body Padded swivel seat twists and turns with your lower abs for core strengthening