Mark Wahlberg tells Ellen DeGeneres why he wakes up at 2.30am every morning

It's no secret that Mark Wahlberg is a gym junkie, and has maintained a physique that's out of the reach of most young bodybuilders, despite nearing his 50th birthday.

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But that kind of reward doesn't come easy, and the Italian Job actor has proven to us all just how hard he works for it during an appearance on The Ellen DeGeneres Show.

DeGeneres was quick to mention how strong and lean the Hollywood A-lister was looking, and mentioned that while she knew he used to set his alarm for 4am to wake up and work out, Wahlberg now rises at an eye-watering 2.30am to get his daily sweat in.

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"I'm just getting busier and busier, less and less time in the day to get everything done," he told the talk show host of his extreme schedule, and even DeGeneres seemed shocked by his work ethic.

"It started when I was in Europe. I was overseas and I'd come home to visit, and by the time the family went to bed I'd be up for the rest of the night," he added. "I'd usually go to bed about 5am and wake up about 12pm then work out and do all my stuff."

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Wahlberg went on to say that while it seems as though the routine works for him, he plans to go back to a "normal" schedule when he finishes up his filming responsibilities.

"When I finish this movie in Los Angeles I'm going to start getting back to a normal schedule, wake up at like 6am like normal people and sleep in… all that fun stuff," he said.

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"OK, well... 6am isn't really a sleep-in," DeGeneres reminded the 49-year-old as she laughed. She shared a video of the star doing chin-ups, also discussing how Wahlberg took Ellen Show producer Andy on an F45 workout that "nearly killed" him.

Wahlberg joked as he watched the clip, "Some days I wake up and I feel like I'm 80, other days I'll feel like I'm 15."

The Ellen DeGeneres Show airs weekdays at 12.00pm on Nine. Catch up on latest episodes on 9Now.