2.3. Participants Surfing Demographics

Participant surfing history was collected and reported through the Surfing Medicine International Surf Years Calculator application on a mobile phone. This app produces a numerical value of an individual’s lifetime surf exposure, referred to as surf years, and incorporates additional surfing hours during holidays and time periods where there is reduced participation in surfing [20]. A single surf year is defined as five hours spent in the water surfing every week for one year.