Believe it or not, there are actually some athletes who are pretty good at acting!
Kareem Abdul-Jabbar
Kareem tops the list for his remarkable turn in Airplane, which consists of him staunchly denying that he is Kareem Abdul-Jabbar until a little kid's criticism forces him to his own defense. But he's also up here for his excellent turn in one of the greatest martial-arts movies of all time, Game of Death, in which he takes on legendary actor/warrior Bruce Lee.
Source: images3.cinema.de
Arnold Schwarzenegger
A former and incredibly successful bodybuilder, Arnold Schwarzenegger places #2 on our list not for his acting chops, which, though passable, aren't exactly Oscar-worthy. Instead, he charts because of his role in multiple emblematic and hugely profitable movies, including the Terminator series, Total Recall, and a bunch of others.
Source: thatsitguys.com
Ray Allen
Again, Allen's starring role in He Got Game wasn't exactly Oscar-worthy. But it was entirely capable. And the fact that he took on a leading-man character named Jesus Shuttleworth in a Spike Lee joint opposite Denzel Washington at the age of 23? That takes incredible guts.
Source: wac.450f.edgecastcdn.net
Jim Brown
Jim Brown was in The Dirty Dozen. That should sum it up.