The initial visit of the participants at the SMRL will be the occasion 1) to verify the inclusion criteria, 2) to validate their answers to the online questionnaire, 3) to determine the appropriate shoe size, 4) to allocate each participant to one of the study arms according to the randomization list (see stratified randomization), 4) to deliver the shoes, 5) to collect some anthropometric measures, and 6) to perform the biomechanical test on the treadmill.