| 摘要 |
An exerciser includes a rod laterally secured in a housing and having two ends extended outward of the housing. One or more wheels are rotatably secured in the housing and include a lower portion extended downward beyond the housing for engaging with a supporting surface. A pinion is secured to the wheel. A gear is rotatably secured in the housing and engaged with the pinion. One or more springs are secured between the gear and the housing for recovering the gear and may limit the rotational movement of the gear relative to the housing.
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