****Background**** Strong evidence shows that physical inactivity increases the risk of many adverse health conditions, leading to shortened life expectancy. The EU *DG Research and Innovation* invited five ongoing FP7 and Horizon 2020 research projects on health enhancing physical activity (PA) to share their experience with other stakeholders, to discuss how to enhance PA, to share best practices and to draw recommendations for policy makers. A workshop was organised by the research projects themselves, in collaboration with EC services. The project teams worked together organizing sessions to explore common themes and to learn from one another, enhancing their own knowledge with insights from their peers. ****Methods**** Our research project’s (Credits4Health) session engaged the participating European researchers in identifying and prioritising future areas of research into the promotion of PA. This task was implemented through a four part approach: • A systematic review of meta-analyses of PA behavioural interventions • A subsequent pictorial review of current behavioural science knowledge presented to participants as a starting point for discussion • A brainstorming exercise, generating research concepts • An opportunity for participating researchers to prioritise the research themes they would most like to invest in. ****Results**** The review of meta-analyses identified a need for further research in the areas of social and psychological mechanisms of motivation and the contexts that are most responsible for changing sedentary behaviours. The Credits4Health task resulted into 8 research themes prioritized as follows: 1. Inequality – Interventions for the most disadvantaged 2. Cross-Discipline Working – A need for mixed methods and multi-disciplinary work 3. Multiple Level Interventions – Acting on across environment, cognitive behaviour change, and incentives 4. Understanding (In)activity – Understanding the psychological components of inactivity 5. Learning from Others – Informing PA interventions from other disciplines and contexts 6. Personalised Interventions – Tailoring the use of behaviour change techniques to individual psychological profiles 7. Integrating Technical Knowledge – What can technology help us to achieve? 8. Capturing Research Data – Designing more visual interfaces for research and interventions. ****Discussion**** A series of PA research priorities were identified. Based on the meta-analyses review and proposed research themes, there appears to be a need for creating more diverse research consortia, seeking to develop a deeper understanding of physical inactivity and multi-disciplinary approaches and to tackle inequality through multi-level interventions. ****Implications**** National approaches to PA promotion might benefit from similar stakeholder engagement exercises and from the formation of multi-discipline consortia, seeking to address inequality and physical inactivity through multi-level interventions. **Credits4Health has received funding from the European Union's Seventh Framework Programme (FP7/2007-2013) under grant agreement n° 602386.*