ET got Tom Cruise's reaction to the 18-minute viral video that shows every running scene he's done on the big screen when we caught up with the action star at the Jack Reacher: Never Go Back premiere on Sunday.

"Is it a full 18 minutes?" Cruise asked ET on the red carpet in New Orleans. "That's a lot of takes too."

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From the classic airport scene in Jerry Maguire to scaling the 2,700-foot tall Burj Khalifa in Mission: Impossible - Ghost Protocol, the clip shows all of Cruise's classic sprints that have been his trademark for 30 years.

"I had to figure it out, because in some of these movies, the runs are so long and I might have to do 50 sprints in one day," Cruise said. "With different camera angles we do more than that, so it's interesting training for them."

All those years of cardio pays off in the second Jack Reacher film. The sequel has the titular hero returning to action to help Susan Tuner (Cobie Smulders), the woman who took over the elite unit he once commanded.

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But all that time on his feet might have called for some rest. Before the premiere, Cruise was caught in a rare moment lying down on the job when he went around a conveyer belt at an airport baggage claim.

"I've always wanted to do that," Cruise explained. "In the middle of the night we were just playing around ... No one checked us!"

Jack Reacher: Never Go Back hits theaters Oct. 21.