The goal of this article is to deal with the professional gestures of PE teachers from the study of contextualization gestures as part of a socio-didactic approach. Our reflection is in line with research in the sociology of education that aims to update the processes by which teachers' practices are unevenly effective and socially inegalitarian (Rochex & Crinon, 2011). Our research is specified in two ways, the subject teaching discipline, the physical education, and the context of teaching, the disadvantaged school. This one constitutes a true laboratory of study privileged in authentic school situation of practices of adaptations, differentiation, adjustment conducive to the construction of the inequalities. Our approach consists of characterizing the professional gestures of the teacher and more specifically his contextualization gestures considered as a combination of professional gestures that have the particularity to adjust to the diversity of contexts. The data collected is based on an intervention analysis by two teachers practicing in disadvantaged school that we filmed and subjected to semi-directive interviews and self-confrontation. The results allows to identify different gestures generating inequalities of access to school knowledge that are related to the way the teacher circulates on different scales of context in order to understand and act on pupils' activity, the possibilities of access to secondarization work offered to students (Bautier & Goigoux, 2004), to the risk of "anticipatory" deprivation of knowledge to which students are exposed without the teacher's knowledge, and finally to the many dilemmas to which his actions contextualization are exposed.