South east asians i.e Cambodians, Vietnames, Thai etc. are genetically the smallest people in the world. Being an ectomorph with terrible bone structure and lack of height are major shortcomings for bodybuilding.
In Japan there are some very big guys nowadays with huge bone structures and gigantic calves, however with very strict drug laws it's almost impossible to get gear and muscular physiques are not the ideal.
Every idiot wants to play soccer or baseball, gyms are full of housewives and retired men.