The purpose of our study was to describe abdominal muscle performance as measured by the DLLT in healthy men and women between ages 18 and 29 years for use as a component of a clinical assessment of core function. In addition, we investigated the potential influence of 9 factors (sex, age, leg length, height, body mass, physical activity level, regular program of physical activity, regular program of abdominal strengthening, frequency of abdominal strengthening) on abdominal performance as measured by the DLLT.