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."
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."