3. Alexander Ludwig: Lone Survivor
Source: muscleandfitness
Alexander Ludwig moved from a mere puny kid star in the movie The Seeker to Race To Witch Mountain to hulking masses of muscles in Lone Survivor and The Hunger Games. The kid is only at 22. Even though he had bulked up for the initial Hunger Games, he had to gain more amounts of mass for Peter Berg`s war movie, Lone Survivor.