The acrobat amazed the audience with his Risley skills, juggling three balls with his feet while lying down.

Risley 是一种杂技表演技巧的名称，源自19世纪美国杂技演员Richard Risley Carlisle的名字。这种技巧的特点是表演者躺在地上用脚来抛接物体（如球或其他道具），有时还会同时进行其他高难度动作。