09/29/2016 AT 02:00 PM EDT  is baring more than his (extremely muscular) arms.  The actor and star of the  talked about working out and finding success in Hollywood – as well as wife  Theroux chose to put his body on display for the photo shoot but spoke candidly about Aniston becoming an unwilling target of obsession with her shape – which led the actress to pen an  Patrik Giardino / Men's Health  "I was very proud of what she wrote," Theroux says in the  . "It was a rare insight into how disgusting all that is. At some point it becomes bullying."  "It sucks when people aim cameras at your stomach on some bizarre womb watch. But more to the point, it's equally damaging to the national conversation."  , Theroux says he tries to get in the best shape possible before embarking on a new project since it gets tough to maintain a workout routine.  Patrik Giardino / Men's Health  "You have to come in to filming in the best shape you can because as the hours and weeks grind on you, you find yourself not having the luxury of going to the gym and doing the big workouts you like to do," he says. "The beauty of workouts now is that you really just need some rubber bands and a kettlebell and you can set up anywhere."  Theroux also has a few rules when it comes to  Patrik Giardino / Men's Health  "The one thing that is unchangeable is I refuse to wear shorts. I just don't think it's a good look on anybody," he says. "It's the same with flip-flops. I don't think anyone should wear those things unless they're in rehab, in hospital or on a beach. I just prefer jeans and boots."  He sticks with his trademark jeans-and-boots uniform because he knows it works – and Theroux says he sticks to his instincts for all decisions.  Patrik Giardino / Men's Health  "I only ever find myself unhappy if I mistrust my gut. If I've learned anything, it's to do what I want based on my taste. Usually I enjoy myself. It's simple advice, do what makes you happy. But I've been very successful, at least on a happiness level."  It's part of what make him a modern man.  "I just find non-modern men very boring. Just because they seem rigid, stuck in the old tropes of what it means to be a professional, a boyfriend, a father. Those kinds of things."  Justin Theroux in Men's Health U.K.  Patrik Giardino / Men's Health  Theroux's full interview appears in the November 2016 issue of  , on sale now. It is also available as a digital edition.
Justin Theroux talks about the media's obsession with Jennifer Aniston's womb, his six-pack abs and acting in Men's Health U.K.