If your foot feels tense, stand with one hand on a wall for support and place the arch of one foot on top of the ball.
如果你的脚很紧张，一只手倒站在墙面支撑着把一只脚放在球上形成一个拱门。
If your foot feels tense, stand with one hand on a wall for support and place the arch of one foot on top of the ball.
如果你的脚很紧张，一只手倒站在墙面支撑着把一只脚放在球上形成一个拱门。
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