It's easy to confuse this gym for a prison yard: The stripped-down interior and bare-bones furnishings don't imply a cushy afternoon, sipping lemonade post-sauna. But that minimalist approach to fitness is the Ross Avenue location's source of strength. There are no distractions here. Instead, there's a revolving workout program that changes daily, so you can't rest on your lumpy, unchiseled laurels. The center's intense approach to exercise winds up working out your entire body, not just the areas that you're most comfortable flexing in public. Soon, your frame slims down while your muscle mass builds, and you can't help but notice a feline touch of agility in your previously uncoordinated gait. The demanding nature of each class combined with the supportive mentality of your fellow sufferers is a 180 from traditional gyms, where folks wander aimlessly, lifting things without intention. But maybe most important is this: When you leave a rigorous session that you initially couldn't believe you would finish, you realize your limitations are strictly mental. If you can do this, you can do anything.