• A TRUE abdominal crunch machine
• Combination of upper and lower movement arms reinvents the original Nautilus^® Abdominal Crunch (the ‘clamshell’) with modern-day technology
• Four-bar linkage on upper movement arm provides a moving axis of rotation around the thoracic region of the spine for ultimate user feel
• Standard 250 lbs (125 kg) patented dial weight selection technology, with a 5 lbs (2.5 kg) incremental weight switch
• Optional 1 lb or 0.5 kg increments weight switch available on all machines