Genetically Koreans are athletic specimen. They are almost on par with men of African descent in regards to their predisposition for being well developed from a muscular and quick twitch standpoint. Certainly far exceeding Caucasian kids around the U.S.
Outside of that linebacker for the Dallas Cowboys a few years back and Manti Teo, Korea is a largely untapped market with stud ponies just waiting to be discovered... The 1st place to start looking IMO would be the speed skating rinks in Seoul.