Aid climbing is a style of climbing in which fixed or placed protection is used to make upward progress. In the Yosemite Decimal System used in the US, it is sometimes called "6th class" climbing.
The term contrasts with free climbing in which no artificial aids are used to make progress. In aid climbing, the climber ascends by hanging on, and climbing on, his or her equipment; in free climbing the climber ascends by holding onto, and stepping on, natural features of the rock, using rope and equipment only to catch them in case of a fall, and to hang on at belay stations. In general, aid climbing places less emphasis on athletic fitness and physical strength but more on technical skill, though the physical aspects of hard aid climbing should not be underestimated. Aid techniques are most often utilized on extremely steep and long routes, demanding great endurance and stamina, both physical and mental.

Aid Climbing in a Three Person Team - Article by Ken Younge and Tuan Luong giving personal experiences, tips, and techniques.
Big Wall Climbing - Trip reports. Ratings explained. Equipment list. Photos. Route suggestions.
Bigwall.com - Topos, beta, trip reports and photos from walls in Yosemite, the Sierra Nevada, Zion, Fisher Towers and Black Canyon of the Gunnison. Plus the Aid Climbing Guide to Southern California.
Climbing Magazine: Big Walls - Article by Pete Takeda on how to get started.
Meta Description: [ Climbing Magazine’s mission is to inspire people to climb, to seek new challenges, and to learn about the great diversity of our sport. We strive to be thoughtful, inclusive, and unswervingly authentic. We look out for the long-term vitality of our sport and our community by providing leadership,... ]
Hints For Big-Wall Climbing in Yosemite - Tips for beginners, climbing in a three person team, soloing, hauling, and improving speed compiled by Q. Tuan Luong.
SuperTopo: The Road to The Nose - Sells Chris McNamara's fourteen climb program for building skills, speed, endurance and comfort with big wall exposure. Includes topos.
Meta Description: [ SuperTopo offers the world's best rock climbing and mountaineering route information for Yosemite National Park in both online downloadable format and in printed books ]
TradGirl Climbing FAQ: Aid Climbing - Frequently asked questions about aid climbing with answers compiled from rec.climbing.
Meta Description: [ Frequently asked questions about aid climbing. ]
Trango Russian Aid System Review - Review from GearReview.com.
Meta Description: [ A review of the Trango Russian Aid System for aid climbing ]
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