Notice that the juggling itself isn't that difficult, technically speaking. What makes this brilliant is the delivery, the patter, the schtick surrounding it. In control at every moment, he gives the impression of being on the edge of chaos.
If your writing is technically competent, but could use more energy and life in the delivery, watch the video again. Look at what does he does with his hands vs. what he does with his voice and body. Then go a little crazy.
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