Tailored advice on running injury prevention in trail running

INTERVENTION: TrailS6 is an evidence‐based tailored advice intervention based on the running injury profile given by the Oslo Sports Trauma Research Centre (OSTRC) questionnaire. The intervention is aimed at changing preventive behaviour and consequently reducing the prevalence of running injuries repeatedly measured over time in trail runners. ‐ Intervention group: After the baseline measurements, the participants assigned to the intervention group will receive evidence‐based general advice towards running injury prevention. During the follow‐up, participants with no running injuries according to the OSTRC questionnaire will receive a reminder of the evidence‐based general advice in order to maintain their no‐injured status (primary prevention). Participants with non‐substantial running injuries according to the OSTRC questionnaire will receive evidence‐based tailored advice in order to prevent the non‐substantial running injury to become a substantial running injury (secondary prevention). Participants with substantial running injuries according to the OSTRC questionnaire will receive evidence‐based tailored advice in order to prevent further consequences or permanent damage related to running injuries (tertiary prevention). ‐ Control group: After the baseline measurements, the participants assigned to the control group will receive evidence‐based general advice towards running injury prevention. However, during the follow‐up they will not receive any further intervention. CONDITION: Prevention, Running related injuries ; ; PRIMARY OUTCOME: ‐ Preventive behaviour;; ; ‐ Prevalence of running‐related injuries repeatedly measured over time. SECONDARY OUTCOME: ‐ Determinants of preventive behaviour (intention, attitude, subjective norm and perceived behaviour control); ; ; ‐ Evaluation process of the intervention (reach, effectiveness, adoption, implementation and maintenance) INCLUSION CRITERIA: ‐ Individuals aged 18 or older; ‐ Individuals involved in trail running (training and/or competition).