This chapter describes the use of action control factors within current physical activity (PA) messaging research. It offers a conceptual frame for examining action control messaging applications and proposing future research directions. The chapter highlights how the action control processes may be tested and offer future directions to examine propositions in more detail. Rhodes and Yao recently overviewed 16 action control models that have been specified in PA research. In order to be classified as an action control model, the constructs of model had to include post-intentional constructs that explain how intentions are translated into behavior. The relevant evidence for messaging of affective judgments and action control comes from experimental intervention. For example, Conner et al. examined the effect of affective-based persuasive material on subsequent performance of PA over few weeks. They found that participants exposed to persuasive communications about enjoyment and affect management aspects of PA increased PA more than material focused on health benefits or a control group.