11.Ashton Kutcher is a purple belt in Brazilian jiu-jitsu.
12.Sarah Michelle Gellar performed most of her own stunts for Buffy the Vampire Slayer, and she stays in shape now with martial arts, gymnastics, and kickboxing.
13.Taylor Lautner won first place in three Junior Karate World Championships by the time he was 12.
14.Evan Rachel Wood has a black belt in tae kwon do and she's trained on the trapeze.
15.Jake Gyllenhaal became a proficient boxer for his role in Southpaw to make his character look and act as authentic as possible.
16.Robert Downey Jr. practices Wing Chun, and credits it for his ability to stay well and focused.
17.And before becoming president, Barack Obama got a green belt studying tae kwon do in Chicago. In 2009, on presidential business in South Korea, president Lee Myung-Bak awarded him an honorary black belt.