| 摘要 |
A base is configured to stabilize rolling movement of the exercise ball under the influence of a user seated on the ball. The base defines a range in which rolling movement of the ball is unimpeded by the base, and has an obstacle portion configured to impede rolling movement of the ball beyond that range. This enables the base to stabilize the ball and the seated user upon rolling movement of the ball into contact with the obstacle portion of the base.
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