Out actor Neil Patrick Harris says he's having a blast playing Hedwig in the Broadway production of Hedwig and the Angry Inch.

Hedwig took home four Tony Awards last month, including Best Revival of a Musical and Best Actor in a Musical for Harris.

Hedwig, which had a long off-Broadway run at New York City's Jane Street Theater and was later turned into a movie in 2001 starring John Cameron Mitchell in the title role, tells the story of a transgender rock musician's search for “my other half.”

Andrew Rannells (Book of Mormon, Girls) will take over the role starting August 20.

Harris discussed the role's physical demands during an appearance on Good Morning America.

“It's like a crazy rock and roll, tour de force-y kind of role and I've been having a blast doing it,” Harris said. “It's killing me. It's slowly crushing me physically but that's why we act.”

“Is it the hardest thing you've done?” GMA co-host Lara Spencer asked.

“Yeah, it is, because when you're first rehearsing it you're learning about it. And then when you're first performing it, you're sort of shell-shocked, and so you have to sort of maneuver your way through it. And yet you're also trying to be Iggy Pop and sort of be spontaneous punk, and with that comes, you know, flailing and doing it differently every night and different improvisation things that happen.” (The video is embedded on this page. Visit our video library for more videos.)