To play a role of Spartan in 300, Gerard Butler use to workout 6hrs a day, he added more than 10 lbs of muscles to his frame.
In addition to losing fat and gaining 10 lbs of lean muscles, Zac Efron built washboard abs in just 12 weeks for Baywatch.
Jake Gyllenhaal turned into a total beast, he gained 15 lbs of muscle weight to play a role of boxer in Southpaw.
Chris Pratt shredded 60 lbs in 6 months for 'Guardians of the Galaxy', he use to do 3 to 4 hours of daily kick-ass workout.
The star of Marvel's Eternals, Kumail Nanjiani under went a major transformation by gaining 25lbs of muscles in 10 months.
Raising the bar again Dwayne Johnson did a transformation for his role as Black Adams, he ripped his body like never before.