Wladimir Klitschko, Arnold Schwarzenegger swap shirtless Twitter photos

Ukrainian boxer Wladimir Klitschko and former governor of California Arnold Schwarzenegger have struck up a friendship on social networking website Twitter.

Klitschko posted a photo of himself posing shirtless in front of an old body-building poster of Schwarzenegger, which was followed by the message: "Trying to catch u since I'm 12."

The former actor responded with: "Great shot! It's fantastic to see one of my favorite champions nailing my pose."

He then returned the favour by posting a shirtless photo of himself with his arms folded in front of an old poster promoting one of Klitschko's previous fights.