It's all of them, along with all professional athletes and all movie actors/pop musicians.Yep. That is a lot of these fitness models. They have to dabble with these things sometimes.
Unless a man is between the ages of 15-25, he cannot get a six pack or super-defined, super-cut muscles. That's because of metabolism + testosterone; the high metabolism of adloescent/young adult burns off all excess calories/fat fast enough to show the abs while the male hormone testosterone allows muscles to become that defined.
Bu as men age, their metabolism slows down, and past at least 25 they need to add cardio to reduce the fat covering the muscles.
However, as most bodybuilders learn, the increase in cardio causes a decrease in muscle definition, e.g. Sean Connery quit bodybuilding because he didn't want to stop playing soccer on the weekends, and he realized if he didn't stop he would not be able to compete with guys who solely concentrated on bodybuilding, since their muscles would be more defined.
In otherwords, anyone man walking around with six-pack abs or looking super cut and is past 25 is on the juice.
It's even worse for women---no woman can have six pack abs or defined muscles naturally, because they lack the testosterone to create it. So if you see a woman sporting six-pack abs or anything more than lithe muscle, she's definitely on PEDs.
It's sad I have to write this. Most people understood this in the past. But these days Hollyweird pushes crazy body ideas on both men and women.