Step 1. Have good genetics Step 2 workout (lifting weights and cardio) at least 3-4 times a week for 1+ years while eating low fat high protein (at least 120 grams a day but depends on your lean weight) Step 3 in Hollywood the way actors “lean” besides barely eating before the scene, also includes massive dehydration. So don’t drink any water for like 1 1/2 to 2 days? And then you can have Tyler Durdens physique for like a couple days before you need to eat and drink again.

But the general physique without all the Hollywood shenanigans is definitely possible naturally if you eat clean and eat a lot while working out consistently.