For me its tough to pick just one genre of music, there is so much out there that picks me up and gets me going. I'm a metal fan also, pantera the whole vulgar display of power cd, and some of cowboys from hell ... that shit pumps me up. I am also a huge hip hop fan, mos def gets me going, freeway, methodman/redman, I could go on ...
Most gyms play shitty music because its more or less a family enviorment ... its hard to keep a gym open if the only people that are members are meatheads/metal heads