In preparation for his TED Talk, Business Insider reports, Ferriss practiced under what he believed could potentially be the worst conditions. He slept for a mere four hours, and then waited around all day for the time his TED Talk would be scheduled to start.

Then, as if he was onstage for the real thing, he began to practice. This way, he would know that even if he didn’t have a great night’s sleep the night before, he had already prepared for those less-than-ideal circumstances.

Ferriss also has other tricks, including practicing with an accelerated heartbeat.

“You want to train as you’re going to compete,” says Ferriss. “You want to expose yourself to different kinds of stresses.”

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