Previous researches aiming to increase physical activity motivation in rehabilitation have predominantly focused on interventions at an individual-level. Whilst it is important not to completely disregard this approach, the NHS rehabilitation setting is typically a place where clinicians have to facilitate sessions on a group-level. Furthermore, the NHS may not have the resources to provide the sufficient level of treatment fidelity that one-to-one approaches require in order to be successful. Therefore, the current research will equip clinicians with skills to be effective for increasing group-level physical activity motivation, as well as on an individual level.