 Since its beginnings in 2007, STA has prevailed in legislation and construction of over 20 miles of new trails in the Anchorage area (Alaska).In 2000, Clemson University (South Carolina, U.S.) Department of Crop, Soil and Environmental Sciences conducted a study on mountain biking and the sustainability of the sport as it relates to the natural environment.The researchers outlined four capacities that must be met in order to sustain a trail or trail system