Thematic analysis
Two central organising themes were utilised: mobile app techniques and external factors. User’s experiences with mobile app techniques clustered around four broad behaviour change technique categories, or themes: logging and monitoring physical activity; reminders and prompts; workout videos and written instructions; and social features. Social influences were also noted as a key external factors (see Table Summary of themes and sub-themes from photovoice and interview dataIllustrative photovoice data; Pictures promoted discussions on 