Now the fifth grader is a blue belt. Karate has "given him a greater ability to focus and to struggle with things that are difficult," says Terranova. Vincent puts it more simply: "Karate makes me ...

The most common belt colors are: white, blue, black, and brown. This depends on training institutions and countries. The highest ranking is normally the black belt, and mostly worn by trainers ...

Meta CEO Mark Zuckerberg showed off his new blue belt in jiu-jitsu — the latest achievement for the amateur martial artist as he prepares for a possible cage match with his tech rival.