Running can cause considerable health and economic burdens, with a reported injury incidence of between 18.2 to 92.4%. Strength is a factor that has widely been linked to injury, however its associations with injury among this population require further investigation. To date, studies have mainly compared the muscular strength of currently injured and uninjured runners. This study endeavours to investigate differences in isometric muscle strength among healthy runners with and without previous RRIs in the past 2 years.