Adjustable Core Resistance Springs: Tucked beneath the frame are high-tension springs that provide customizable resistance during sit-ups and crunches. They assist you on the way up and offer resistance on the way down to maximize muscle isolation. [1]Integrated Pedal Cycle Unit: Located at the front base, this attached foot pedal setup allows you to combine your abdominal workouts with low-impact cardiovascular training for lower limb strengthening and six-pack-care-abs-fitness-machine-with-pedals/)Ergonomic Foam Back Roller Supports: Equipped with multiple dense, padded foam rollers that contour along the spine. These provide cervical and spinal support during motion, cushioning your back and neck to minimize strain