Archosaurs diversified explosively in the Triassic period, with disparate forms including small and large animals, sprawling to erect limb postures, and quadrupedal to fully bipedal locomotor modes. Only the crocodylian and dinosaurian lineages survived the end-Triassic mass extinctions, and the “locomotor superiority hypothesis” has been debated to explain why dinosaurs were so successful throughout the later Mesozoic. Here we present how we use cutting-edge physics- and physiology-based models of archosaurian anatomy and locomotor behaviour to test that hypothesis with new rigour and realism. Importantly, these simulations are grounded in experimental tests applied to living archosaurs (Nile crocodiles and tinamou birds) to gauge their validity. We explain the workflow that we are finalizing to build the community's confidence in, via enhanced transparency, objectivity and repeatability of, these models and simulations. These models and simulations are already revealing insights into the links between musculoskeletal form and function in archosaurs, as well as decoupling between them.