An indoor facility that offers rock climbing lessons for boulder, lead climbing and toprope training.. In Short With two locations, ARG boasts the state's largest and most sophisticated climbing gyms for Austinites interested in state-of-the art, specialized facilities. Walls up to 34 feet tall have challenging, enjoyable routes, designed to provide a true climbing experience--cuts, scrapes and all. A "wallmaster" changes routes regularly, to keep them current with climbers and their skill levels, all the while insuring that there's something challenging for everyone. Indoor and outdoor classes are available.