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Ben Stiller Reveals Major Lifestyle Change (VIDEO)

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Ben Stiller is looking quite fit these days, and perhaps it has something to do with his latest film "The Watch." In the film, Stiller plays a neighborhood watchman and tests his physical limits in several action sequences. When Conan O'Brien beamed over Stiller's running scenes -- who knew he could run? -- the actor revealed his fitness secret.

"I just try to run like Tom Cruise because I think he is the ultimate runner," said Stiller. "I can do it for like about 15 yards, and then I get out of gas."

The actor also told Conan that he recently gave up coffee and embraced a vegan lifestyle. Stiller doesn't like to call himself a vegan, however, and mentions the hardships he faced beginning his new dietary venture. "I had to tell my parents I was a vegan, I came out to them," said Stiller. "They were a little bit confused at first, but now they're supportive."

Being a vegan hasn't been an easy ride for Stiller, who admits he still misses certain foods. "I ate kale chips today," said Stiller. "I wanted to have ribs, but I had kale chips."

Watch the above video for more about Stiller's new lifestyle and his thoughts on nut cheese.