Colin Cheng Chung-hang recently showed the South China Morning Post some of the techniques he has mastered in wushu, a martial art also known as Chinese kung fu. The 32-year-old says wushu has changed his life, and put him on the world stage. Cheng won a gold medal at the 2011 World Wushu Championship and earned bronze at a tournament in Beijing held during the 2008 Olympics.