THE ETHOS that guides those who are permanently fit — other than staying permanently fit — is that working out is a luxury, not a chore. High-end hotels have started applying that philosophy in a literal way, with unique training regimens that allow you to train with shamans on the Adriatic Sea or prepare like an extra in 300 at a minimalist Miami Beach lodge. It seems the more exotic the location and the stranger the amenity, the bigger the adrenaline charge. Here are five spots where fitness junkies can take a break from vacation.