A spray wall is an overhanging climbing wall almost fully covered by a great variety of different sizes and shapes of climbing holds, in apparent chaotic distribution. [1] It is used to train power, endurance and routesetting. [2] [3] [4] [5] [6] [7] [8]
According to Noah Walker, author at Gripped Magazine, one of the main differences between a spray wall and a standard climbing board is that spray wall's greater hold density force climbers to develop their own problems; [9] in particular, he states that the large grips (more frequent on spray walls than in standard boards) force to use similar three-dimensional movements and precarious heel hooks that are necessary for climbing natural walls; [9] he insists that on a spray wall, a climber can't become as easily used to the distances between holds as with a Moon, Tension, or Kilter board. [9]
Exercise training researchers stated that spray walls help to develop routesetting skills more than standardised training walls, because they force climbers to "observe, memorize, and mimick the problem-solving strategies and motor actions of other climbers" as in outdoor climbing. [10]
Professional rock climber Adam Ondra considers it a better tool to develop physical strength for climbers than campus boards or pull-ups. [1]