Ken Jennings on the 'Jeopardy!' prep trick he swears by and the category that made even him sweat

Ken Jennings says that "Jeopardy!" fans who want to be contestants shouldn’t overthink their preparation.

"I would say watching the show is the best way to prep for the show," the host explained to Fox News Digital on the red carpet for the TCM Classic Film Festival. "If you watch ‘Jeopardy!’ like the rhythm of the host's voice will kind of get into your pulse. You'll know the kind of stuff that comes up, the kind of material. That's how you become a good ‘Jeopardy!’ player."

And if someone is trying to cram for the show...