How to: Sit on a stability ball with feet hip-width apart on the floor.

如何锻炼：稳坐在一个球上，双照着地，与胯同款。

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Width Setting: Width setting is controlled by servomotor with ball screw and guide rails to make accuracy movement.

切卷定位系统：使用伺服马达控制高精度滚珠螺杆进行尺寸定位及使用线性滑轨承载刀座。定位动作精确平顺。

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With the man advantage Saracens put width on the ball and were rewarded when Short raced round the defence for the opening try.

BBC: Gloucester 19-13 Saracens

Harmison looked more like the bowler who previously struggled with the white ball, offering too much width as the stylish Amla carved him away for four boundaries in an over.

BBC: England maintain perfect record

We play with width and to try to move the ball around and we have to be good at those aspects because when we're not, we come second.

BBC: London Irish coach Toby Booth questions accuracy