  The isolation and control of disparate degrees of freedom underpin quantum
simulators. We advance the programmability of cold atom quantum simulators with
a first realization of the dynamic interplay of spatial and spin degrees of
freedom. We experimentally demonstrate that violent spatial evolutions tune
long-lived coherent spin dynamics and develop a model of quantum spin-mixing
incorporating the spatial evolution via time-dependent spin-spin interactions.
Our results open new paths towards the simulation of quantum spin models with
tunable interactions via tailored spatial dynamics.
