This particular LA fitness has the best cardio workout in the valley. It's actually called a zumba class but it should be called, 'kick your butt, extreme cardio, not for the faint of heart dancing'...The instructor is this super fit, highly motivated guy called LEO... He is a dancer, I believe... I have seen him going around the room and making women, men, fit ones, big ones move like there is no tomorrow... Zumba Leo is probably the best instructor in Phoenix... I think he goes by LD Wolf and offers classes elsewhere too... I run too and I can tell you that running has nothing on this class... I feel exhausted but very happy after the class :)