This paper deals with the problematic of the practitioners of the "street sport" (Duret, 2008) facing the ecological degradation. The objective of the research is to identify the effect of the ecological degradation and the concern related to the dangers of the polluted environment on the well-being of the sport practitioner in the region of West Sfax. The observation of the lived, the interviews and the analysis of contents are the main techniques applied for the collection of information, and especially to understand and elucidate the representations of the concerned sportsmen. The feelings and behaviors of the respondents are then presented, analyzed and discussed.Translated with www.DeepL.com/Translator (free version)