Med-Fit Systems 2009 Nautilus Nitro® Plus Lower Back The Nautilus Nitro® Plus Lower Back is the only full range, lumbar-isolated machine that emulates the function of rotation around multiple vertebrae.     * Four-bar linkage provides a moving axis of rotation that simulates the body's       moving axis of rotation, increasing user safety by eliminating sheer forces on the spine     * Large, flat back pad spreads out over larger area and pivots for user comfort     * Contoured lower back pad allows full range extension     * Adjustable foot platform to position knees above hip joint, eliminating pelvic thrust       and maintaining axis alignment for a successful workout   Length    56" (142 cm)   Width 38" (96.5 cm)   Height 54" (137 cm)   Machine Weight 572 lbs (260 kg)   Weight Stack 200 lbs (91 kg) Core Upper Body Lower Body 1.800.831.7665 1.800.831.7665