"But it will be especially useful for riflemen and snipers, since following the shuttlecock trains the eye muscles, strengthens the cardiovascular system and develops reaction speed," he added.

“不过，它对步枪手和狙击手尤为有益，因为捕捉球路可以锻炼眼部肌肉、增强心血管系统并提升反应速度。”他补充说。

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"You could see the snipers moving up with a naked eye, " says Debra Banks, a 55-year-old from Sacramento, Calif.

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