Thaibox- If you are looking for a fairly hardcore gym, check out J.J.'s Gym in Phoenix.It's on Cave Creek between Greenway and Cactus I believe.They're in the book.It's basically just racks, benches,barbells,plates and a bunch of mean looking powerlifters.Fairly inexpensive as well.If you are looking for a gym to train martial arts, The Hard Knocks Gym is almost directly across the street.It's mainly a boxing/kickboxing gym, but they have tae kwon do and kenpo classes as well.The head instructor is a good guy and he knows his stuff.Good luck!