For singles with a sense of adventure, look no further than Berkeley Ironworks, a Touchstone Gym, for your next hookup. Cougar bait, college coeds, professionals, daredevils, and other adrenaline junkies come here to get their fitness on. Climbing is usually a two-person sport, but don't worry if you don't have a belay partner — just ask at the front desk, and voila, Ironworks will find an instant partner for you. But don't think you have to come here alone either. There are plenty of opportunities for lead climbers and top ropers to exchange encouragement and high-fives with the roped-up athletes around them. One way to meet up with like-minded climbing fanatics is to head to the bouldering cave where the young, shirtless hotties and lean, flexible twentysomething girlies dyno for slopers and crimpers. You can make your introduction as a spotter who keeps Miss Cutie's head off the map if she misses that V5 move. Prefer something more mellow? Give some beta to the scared-stupid kid dangling from the top rope and earn pointers with his single mom or dad. Climbers are a fit lot, so to stay in shape they must do more than jump on the sharp end. That means Ironworks is a well-appointed fitness club, complete with cardio equipment, free weights, and weight machines plus group classes for core strengthening, indoor cycling, yoga, cardio boxing, kick-boxing, and more, including Pilates and capoeira. And you don't have to be a climber to do any of that, now do you?