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‪This article presents an intervention-research carried in activity clinic enriched by an interdisciplinary methodological framework, with the aim of preventing musculoskeletal disorders in the gravedigging profession. The videos of observations of actual activity, followed by interviews using simple self-confrontations and cross-self-confrontations, record dialogues between professionals who intermingle linguistic and gestural statements to discuss their different ways of performing their occupational gestures. By going back over the sequence of the different multimodal action methods (paper-pencil and video observations, synchronous video observations with surface EMG recording of biomechanical demands on the shoulders and back, graphic representations of musculoskeletal demands, single and cross self-confrontation interviews), and their interdisciplinary combinations (activity clinic, ergonomics and biomechanics), this article highlights the dual linguistic and bodily line of professional development, through an analysis of the linguistic and gestural statements that characterise the dialogues produced in self-confrontations.‪