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产品描述：
The Nautilus Nitro® Plus Abdominal machine is the only true abdominal crunch machine.
Product Info
- Four-bar linkage provides a moving axis of rotation that simulates the body's moving axis of rotation, increasing user safety
- Combination of elbow and back pads with hand grips provide upper body stabilization, eliminating lower back muscles' static involvement
- Leg anchoring ankle pads provide lower body stabilization
- Controlled motion movement arms isolates abdominal sheath, eliminating hip flexor involvement
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