| 摘要 |
The device is designed to enable the user to perform both abdominal strengthening and back muscle strengthening exercises on the top of a conventional bed. A conventional bed is defined as one with a semi-rigid mattress and a rigid frame. The device attaches and detaches to the described bed easily and provides the means to strengthen both flexor and extensor muscles of the trunk with the dual advantages of maximum convenience and minimum cost. The device is a departure from the previous art in that it enables the user to strengthen the trunk muscles at home without the necessity of cumbersome and expensive equipment.
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