Michael Weatherly, who plays Anthony DiNozzo on NCIS, recently revealed that he’s dropped more than 30 pounds over the last four months.

Michael Weatherly's 35-Pound Weight-Loss

Weatherly, 46, who participated in the Nautica Malibu Triathlon earlier this month, has credited swimming and a workout pal for helping him shed the extra weight over the summer months in an interview with Closer Weekly.

"My friend and I have been swimming in the Pacific every weekend [since early May], and I lost 35 pounds!" Weatherly said, adding, “I learned that if you say you're meeting someone at 8 a.m. on a Sunday, you have to show up.”

Since a hiatus from NCIS back in May, Weatherly has been charting his fitness progress through social media. He started off his fitness regime with some boxing workouts, captioning a picture of himself donning boxing gloves, “Enjoying the hiatus by replacing the martini with the faux punch. #ncis.”

While training for the traithlon, Weatherly posted a picture of himself preparing to head into the Pacific, writing, “Who’s going in the ocean? #triathlon #ncis.”

Weatherly may have just recently kicked his workouts back into high gear, but the TV star has long been an active runner.

"I started running around my 30th birthday," he told Details in 2012. "I wanted to lose weight; I didn't anticipate the serenity. Being in motion, suddenly my body was busy and so my head could work out some issues I had swept under a carpet of wine and cheese. Good therapy, that's a good run. And I like to sweat. It's better than being cold. I like hot countries. I like endorphins. But I don't want to jump out of a plane or take karate or mixed martial arts."