The Alternative Climbing Gym challenges climbers of all abilities with a 30-foot vertical wall in a 1,500-square-foot facility. Expert instructors put students through the paces of ropeless bouldering, the teamwork of belaying, or top-roping, in which a wall scaler ascends with the help of a rope connected to both the climber and the summit. Each climbing variation at the gym enables bodies to build core strength, balance, flexibility, endurance, and stamina while slapping gravity across the face with a glove. All ages of aspiring mountaineers are welcome to use the facility and modern climbing gear, though belaying’s buddy support requires that sturdy helpers be at least 12 years old. Like the moods of adolescent rock faces, the routes change often.