updated 05/18/2010 AT 2:00 PM ET
•originally published 05/19/2010 AT 7:30 AM ET
At Monday’s Los Angeles premiere of the new Disney film, a lighthearted Gyllenhaal laughed away concerns about his grueling regimen, insisting that becoming buff was simply part of his job.
“It was so hard,” Gyllenhaal told PEOPLE sarcastically. “Being an actor is so hard. Being in shape is so hard, too, and being paid to get into shape is even harder – and you can quote me on all of those.”