In one of the recent Cooking vlogs Sabre makes low-cal cupcakes for Justin. At the beginning, she mentions how he's "gone from overweight to a full on gym junkie" but she thinks he's "ripped" for a 40 year old. I wouldn't agree with that. In my opinion he was "ripped" (more muscle mass) when he was competing in the Olympics in his 20s. Now, he looks like he's been doing too much cardio and not enough weight bearing exercise. At the end of the video Justin said he he's been "very into calorie counting".
Olympic photos for comparison: