Zac Efron Says Running is Really Hard!

Zac Efron hits the red carpet for the premiere of his new movie We Are Your Friends held at Showplace Icon Theater on Wednesday night (August 19) in Chicago, Ill.

The 27-year-old actor took photos with his co-star Emily Ratajkowski and director Max Joseph.

Zac recently opened up about physical changes he made for the role.

“Max just said, ‘Hey dude, look at these guys,’ and he just showed me a bunch of pictures and I’m like, ‘Um, clearly I should…that’s not who I am at this moment.’ And so I just trimmed my diet,” Zac told E! News.

He added, “I ran every day, more or less. I just stopped lifting weights. At the end of the movie I had like shin splints, my knees hurt, it was gnarly. Running’s hard.”

25+ pics inside of Zac Efron stepping out at the Chicago premiere…