02/21/2012 03:58 pm ET

Michael Clarke Duncan On 'The Tonight Show With Jay Leno' (VIDEO)

In the above clip, Michael Clarke Duncan chats with Jay Leno about how his muscles compare to Dwayne Johnson, nicknamed "the Pebble" by Duncan. "The Green Mile" star also spoke to Leno about the uncomfortable position he got stuck in when he attempted yoga -- watch the video to hear the hilarious story.