| 摘要 |
A sit-up exerciser has a body and a back bracket. The back bracket is mounted on and pivotally connects to the body. Multiple elastic elements transversely connect to the lower end of the back bracket and the body. When a user's back presses against the back bracket, the back bracket can be pivoted relative to the body. Meanwhile, the user should resist the resilient force of the elastic elements to keep exercising. Furthermore, the exerciser has a small volume for convenient storage.
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