Indoor-climbing clubs, designed for serious climbers who want to train and continue to work during bad weather, are going mainstream. Some people start climbing for fitness or for fun. Others do it to socialize.
Climbers leave weight and aerobic equipment behind to work their way up concrete walls.
Hip music plays as they concentrate on their next move. Climbing club personnel suggest snug-fitting exercise clothes made of spandex. Choose a climbing technique. In bouldering, you climb without a rope or harness. With lead climbing, you clip your rope as you go up.