Med-Fit Systems 2009 Nautilus Nitro®  Lower Back Core Upper Body Lower Body Four-bar linkage provides a moving axis of rotation that emulates the body's moving axis of rotation Large flat back pad spreads out over larger area and pivots for user comfort Adjustable foot platform places knees above hips to eliminate pelvic thrust and maintain alignment Contoured lower back pad allows full range extension Length 56" (142 cm) Width   38" (97 cm)  Height 54" (137 cm)  Machine Weight 572 lbs (260 kg)  Weight Stack 200 lbs (91 kg) The Nautilus Nitro® Lower Back is the only full range lumbar isolated machine that emulates the function of rotation around multiple vertebrae. This increases core strength and stability, offering the user maximum results. 1.800.831.7665 1.800.831.7665