Without artificial enhancements such as HGH and anabolic steroids, it takes 5-7 years of working out quite hard to get close to a Marvel superhero level body.
Probably a bit less if you’re younger. So I see why more people don’t do it. It takes continual, focused effort and eating well enough to get it done — all the while, people will tell you it’s “impossible.”
Luckily, I’ve made doing the impossible and laughing at the haters and losers my whole thing.