The 48-year-old actor welcomed ET's Kevin Fraizer to the series' set in New York City for an exclusive tour of Bull's surprisingly sporty workspace, which is packed with batting cages, ping pong tables and punching bags.
"Welcome to T.A.C., which stand for Trial Analysis Corporation," Weatherly shared. "We get into the nitty gritty, the gradual aspects of what makes a jury tick. What makes a witness or defendant or a judge or anybody at all to tick."
"The world that this all takes place in, this whole behind-the-curtain, is pure Phil McGraw because this is his world. He understood that this was a way to analyze and take in that data," he said. "It's also a brand new kind of law show and it really makes people sit back and say, 'Oh wow! I do jury duty but I didn't know that happened!'"
Press play on our video above for an exclusive look around the Bull set with Weatherly!
Bull premieres Tuesday, Sept. 20 at 9 p.m. ET/PT on CBS.