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产品描述：
The Nautilus Nitro® Plus Lower Back is the only full range, lumbar-isolated machine that emulates the function of rotation around multiple vertebrae.
Product Info
- 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
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