Abstract
Sports such as surfing, mountaineering, and backcountry skiing are often grouped together. But what exactly it is that they share, and the implications of their common characteristics, have not been explained clearly. I refer to such sports as ‘nature sports’ and argue that they share a fundamental structure in which human beings and features of the natural world are brought together. The principal claim I make is that nature sports are those sports in which a particular natural feature, or combination of natural features, plays at least one of the primary roles that human competitors or partners play in traditional or standard sports. This article is a detailed explanation of that claim