AUSTIN, Texas (AP) - Some advice for when Willie Nelson slides off his sneakers personalized with the word "Texas" on them: Don't mess with him.
The country music icon who turns 81 this week received his fifth-degree black belt Monday in the martial art of Gong Kwon Yu Sul. He cinched the personalized belt around a black robe at an Austin studio.
Nelson didn't show off his chops but Grand Master Sam Um assured a packed room, including fellow Texan Lance Armstrong, that the "Red Headed Stranger" could hold his own against anyone.
Nelson's birthday is Wednesday - though he's claimed before that the date is really April 29, a day earlier.
He credits two decades of martial arts for keeping him physically and mentally fit.
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Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.