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产品描述：
The 2ST? Abdominal machine, a true abdominal crunch machine, provides direct work for the entire abdominal region.
Product Info
- Patented moving axis of rotation technology automatically adjusts to the body's changing rotation for optimum positioning
- Full-range exercise of rectus abdominis isolation
- Positive stabilization of upper torso eliminates static involvement of lumbar erectors
- Complex joint movements are duplicated through the use of a four-bar linkage mechanism providing greater motion control and a decrease in joint pressure
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