Why do Hollywood actors train 2-3 hours a day getting ready for muscular roles?

[Pure Drama]

Of coarse they juice, Ryan Reynolds in ammity ville horror was jacked, and said he achieved his size and definition in 6 months, hard to believe that's all natural

 

[CSB]

hgh is the most common i would imagine from nick nolte to stallone, to most of the females too.i doubt arnold has ever been natural for a role

 

[John McLane]

Of coarse they juice, Ryan Reynolds in ammity ville horror was jacked, and said he achieved his size and definition in 6 months, hard to believe that's all natural

But Reynolds was skinny and had never trained before...so, it's not unreasonable to think that, as his body wasn't used to training, round the clock help from nutritionist's and trainers, loads of rest...he could of done it natural...I gained 20lbs in my first 6 months of training, and that was with an average diet...so why couldn't Reynolds with an exceptional one?