Mere mortals need not apply. At Gym Jones, (indeed, a nod to Jim Jones, the sect leader who drove more than 900 people to suicide in 1978), the workouts are grueling, and the culture, rooted in “The Art of Suffering.” But while the unmarked, invitation-only facility caters primarily to the fitness elite (this is the gym that got 300’s Gerard Butler loincloth-ready), for the rest of us, there’s always online memberships (get ripped at your own risk)