MAIN JUDGEMENT CRITERIA :~Prevention methods used before an ultra-trail via a self-questionnaire~SECONDARY JUDGING CRITERIA : Location of blisters, via a self-questionnaire Presence or not of blisters at the end of the ultra-trail or at the time of abandonment~STUDY SCHEME : Post-race questioning
PRIMARY OBJECTIVE : To evaluate the methods of prevention of the appearance of blisters set up by the runners before and during an ultra-trail~SECONDARY OBJECTIVES :~To evaluate :~The main locations of blisters.~The severity of blisters~The effectiveness of prevention methods To evaluate the incidence of blisters in an ultra-trail context.