Preconception physical activity is one of the main predictors of continued engagement in physical activity during and after pregnancy and subsequently, improves the health of women and their child.In the UK, guidance states that Primary Care health Professionals (PCPs) should assess and discuss the lifestyle of preconception women, in routine appointments, in order to address potentially modifiable risk factors. However, knowledge and provision of this guidance in the UK is unknown.It is not clear if individuals actively seek preconception guidance from PCPs, what guidance they request, and whether PCPs have the knowledge and skills to provide this support in line with current guidelines. This research aimed to explore current practice and the perspectives of PCPs in delivering physical activity guidance to preconception patients. Fifteen semi-structured interviews were conducted with PCPs (GPs and community pharmacists) in the UK. Data was analysed using the Theoretical Domains Framework (TDF). The key TDF domains which emerged from analysis were 1) Environmental context and resources, 2) Knowledge, 3) Social/professional role and identity, 4) Social influences, 5) Beliefs about capabilities, 6) Beliefs about consequences, 7) Reinforcement, and 8) Emotion. Our findings showed patients did not frequently present solely for preconception physical activity guidance, but occasionally enquired when consulting about another issue. PCPs lacked motivation to implement physical activity guidance due to the perception that their advice would have no impact on behaviour change. There were a number of perceived opportunities to implement preconception physical activity guidance in primary care including sign posting and referral to advice such as online resources. These findings illustrate the need for consistent and specific preconception lifestyle and PA guidance for PCPs, with an emphasis on behaviour change techniques and a patient http://mc.manuscriptcentral.com/ac-phm-vcy self-directed intervention, which PCPs can signpost women to may be most appropriate and feasible.