Adena Friedman says that being a black belt in taekwondo has helped her become more fearless in business. The 49-year-old boss of the Nasdaq took up the martial art more than a decade ago ...

He took up the Korean martial art about 10 years ago and has achieved a black belt. "It is sometimes a bit of an effort to come out to do Taekwondo, but it's always worth it," he said. Carroll ...