Strengths and limitations
The strengths of the study include randomisation to each intervention group, objective website and module completion measures, and qualitative data to add context and understanding to the qualitative findings. The study also had a good representation of people with a low household income (46% < A$40,000). A limitation includes the phone and face-to-face contact between participants and researchers, as well as monetary incentives which may have encouraged participants to engage with the intervention more than they would in a real-world scenario. In particular, the face-to face meeting with researchers at baseline may have helped to remove barriers to participation (e.g., syncing Fitbit to the website) and the website usability ratings and Fitbit acceptability ratings may not generalise to a real world scenario without hands on support. Lastly, Fitbit usage was measured by self-report and estimated from daily active minutes recorded by the Fitbit in the week prior to each 