Brisk Walking: Walking at the rate of about 4 MPH with energetic arm motion.

快走：用力摆动双臂行走，速度约为每小时4英里。

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A detecting and control system for arm motion of the humanoid robot is described.

介绍了拟人机器人上肢运动检测与控制系统。

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As a flatpicker, he used a traditional tear-shaped medium gauge nylon flatpick and was known for his speed, tone and precision -- with a little extra arm motion.

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With baseball pitchers it's a certain rhythmically whippy arm motion.

FORBES: People and Things to Like--2005

The umpire will signal the start of the fielding side's choice of powerplay by waving his arm in a circular motion - and indicate a powerplay chosen by the batting side by waving his arms in a circle and then clapping his hands above his head.

BBC: Setting a one-day field