Oh you can get it in hospitals here in the States, too. But gyms (especially school gyms, but mostly all of them) are breeding grounds. Putative reasons are dirty equipment (pads and mats are porous, or at least grainy and the little crevices on their surface can trap sweat and pathogens), unhygienic practices (not washing gym clothes, not bathing- yuck, but it happens), and working out with open wounds (unusual for MRSA to take off on intact skin).