Descriptive data for the personal, anthropometric, biomechanical and training-related characteristics will be presented as count and percentage for dichotomous variables, and as mean and standard deviation, or as median and range, respectively, for normally and non-normally distributed continuous variables. Average sport-related characteristics will be computed for each participant over their specific period of observation. Shock absorption properties of the two types of shoes will be compared using a Student's t test. A two-way analysis of variance (ANOVA) will be used to determine whether any difference in running biomechanics results from the shoe cushioning properties or body mass.