The article investigates how English speakers express futurity choosing between ‘will’ or ‘be going to’. After a literature review of previous studies about the semantic and pragmatic differences between ‘will’ and ‘be going to’, the authors address the research gaps left by past explorations of forms and uses for expressing future prospects by proposing a polysemy-based explanation that considers the role of speakers’ inferences and embodied experience. In particular, the analysis of the data adopts an innovative perspective to examine all the meanings of ‘be going to’ which are related straightforwardly to components of the human walk cycle. In conclusion, the authors argue that the shared future meaning of ‘will’ and ‘be going to’ represents inter-lexical polysemy which is consistent with the Theory of Lexical Concepts and Cognitive Models (LCCM) based on the intrinsic relation between lexical representations and meaning-construction.