This thesis aims to evaluate the reasons for the incorporation of a sport fad to the identity, from the exposure on social networks to postings of content and images related to a particular sport, in this case Crossfit. To achieve this goal, 40-minute individual interviews were performed with 10 women between 18 and 39 years old, all of them Crossfit practitioners. The data collected were qualitative analyzed, through content analysis, of an interpretative nature. As a result, it was concluded that faddism is the main starting point for the practice of Crossfit. Clear evidences of incorporation of this faddism to the identity were found, like the absorption of the sport concepts to the individual and social life, from the way of dressing to behavioral changes, such as in eating habits, self-confidence, self-esteem and the migration to new social groups. The reasons declared by the interviewers for this faddism incorporation range from idealistic sensations, absorbed during the exposure and observation of photos posted on the social medias, related to a challenging and overcoming motivation sport, to the identification with personal characteristics of the user s practitioner identity, exhibited on pictures and through comments in social networking sites.