The body and gestures play a primordial role in everyday activities. From a young age, people develop sensory and motor skills by interacting with the world. Over time, they accumulate experiences and enrich their abilities. Their body is transformed, allowing them to express, communicate and interact with the environment. New enabling technologies contribute to a deep understanding of this interaction, through the capturing of movement, modelling, machine learning and analysis, as well as the transmission of artistic or technical gestures.