The 'Twilight' actor Taylor Lautner is a former junior world champion in which sport?

Taylor Daniel Lautner (born February 11, 1992) is an American actor, model and martial artist. Lautner is best known for playing Jacob Black in The Twilight Saga film series based on the novels of the same name by Stephenie Meyer.

As a child, Lautner took up martial arts in Holland, Michigan and was ranked number one in his category by the American Sports Karate Association. He took his first karate class at the age of six. A year later, he attended the national karate tournament in Louisville, Kentucky, where he met Michael Chaturantabut, the founder of Xtreme Martial Arts. Chaturantabut invited Lautner to a camp he held at University of California, Los Angeles. Lautner trained with Chaturantabut for several years, earning his black belt by the age of eight, and winning several junior world championships.