Background and aimsExercise is a recommended part of type 1 diabetes (T1D) treatment, as high physical activity levels improve health outcomes. However, many people with T1D do not meet physical activity recommendations. The aim of this study was to identify factors influencing physical activity levels in people with T1D. MethodsThis questionnaire-based study included adults with T1D from 1 outpatient clinic in the UK and 2 in Denmark. Exercise characteristics, motivators and barriers was assessed. Physical activity level was measured using Saltin-Grimby Physical Activity Level Scale. Respondents were categorized into three activity groups: inactive, light active and moderate-to-vigourous active. ResultsOut of 332 respondents, 8.4% rated themselves as inactive, 48% light active and 43% moderate-to-vigorous active. 78% of inactive and light active repondents expressed a desire to become more physically active. 53% of respondents had received guidance concerning exercise/physical activity from their diabetes team. Being male and having received guidance, was associated with higher physical activity level. Important motivators for exercising/being physically active were improved mental and physical health and glycaemic control, while most frequent barriers were busyness with work/private life and lack of motivation. Worries about glucose excursions, costs, lack of knowledge, and health related reasons were more prevalent barriers in the least active groups. ConclusionThis study found that 78% of inactive and light active respondents reported wishing to become more physically active. Receiving guidance about exercise/physical activity was associated with higher physical activity level, but only 53% of respondents had received support from their diabetes team.