Dru Forrester, left, and Fe Brinkley, both of Lawrence, earned world champion honors at a recent tae kwon do competition. They and three other students at the ATA Black Belt and Leadership Academy ...

expressed as percentage of participants sustaining an injury that required time off training a year, varied according to style: 59% tae kwon do, 51% aikido, 38% kung fu, 30% karate, and 14% tai chi.