Yoshihiro Akiyama , also known as Choo Sung-hoon (추성훈) and by his nickname Sexyama, is a Japanese mixed martial artist and judoka who won the gold medal at the 2001 Asian Championships for South Korea and for Japan at the 2002 Asian Games. He is the former K-1 HERO's Light Heavyweight Grand Prix Tournament Champion.

Judo is an unarmed modern Japanese martial art, combat sport, Olympic sport, and the most prominent form of jacket wrestling competed internationally. Judo was created in 1882 by Kanō Jigorō as an eclectic martial art, distinguishing itself from its predecessors due to an emphasis on "randori" instead of "kata" alongside its removal of striking and weapon training elements. Judo rose to prominence for its dominance over established jujutsu schools in tournaments hosted by the Tokyo Metropolitan Police Department, resulting in its adoption as the department's primary martial art. A judo practitioner is called a "judoka" , and the judo uniform is called "judogi" .