Inclusion Criteria:  free and informed consent signed Benefiting from a social protection insurance Over 18 years-old Male Having a level of expertise greater than or equal to the national level 4  Exclusion Criteria:  Present during the study or have presented within the year any musculoskeletal pathology in the right and left shoulder. Have a body mass index greater than 30kg / m2 (to ensure sufficient accuracy to measure the movements of the scapula)