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产品描述：
The Abdominal machine is the only true abdominal crunch machine.
Product Info
- Four-bar linkage provides a moving axis of rotation that emulates the body's moving axis of rotation
- Combination of elbow and back pads with hand grips provide upper body stabilization eliminating low back muscle involvement
- Controlled-motion movement arms isolates abdominal sheath and eliminates hip flexor involvement
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