Mark Wahlberg Posts Shirtless Pic of His Impressive Physique After 6 Months of Training and Clean Eating

Mark Wahlberg is proudly showing off his hard work.

The 48-year-old actor shared a shirtless picture of himself flexing on Instagram on Thursday, displaying his defined biceps and chiseled abs. The father of four said he's been eating clean and doing F45 training -- a global fitness community specializing in high-intensity group workouts -- for six months.

"Six months of Performance Inspired Nutrition, Aquahydrate, and F45 training!!" he wrote. "Clean eating. Inspired to be better, team training / life changing. 🙏❤️🙏 @performinspired @aquahydrate @f45_training."

Wahlberg is of course known for his dedication to fitness, previously sharing that he works out at 4 a.m., often gets in two workouts a day and uses a cryo chamber that dips down to 150 degrees below zero to help his muscles after a workout.

He frequently posts videos of himself exercising, including a recent one with his 11-year-old son, Brendan.

Last October, Wahlberg told ET that his Instant Family co-star, 47-year-old Octavia Spencer, joined his 4 a.m. workout club while filming the movie.

"I got phone calls from some of like, the biggest stars in town, like, 'I'm coming to the 4 a.m. club. I aspire to be better.' Nobody showed up," he recalled. "She comes in and she kills it. You know what? She's inspiring so many other people."

Watch the video below for more:

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