Climbing has become a mainstream sport with more participants than skiing or snowboarding and, among the different types of climbing, gym climbing is the most popular. Where gyms were once a training ground for rock and alpine climbers, many participants now regularly climb indoors with no plans beyond tackling the ever-changing routes of their neighborhood hangout. When Mountaineers Books published the first edition of this title in 2004 there were approximately 250 climbing gyms in the United...
