Design of TreadWill
We designed the therapeutic content of TreadWill based on CBT, using the book by Beck [To ensure sequential progression through the intervention, only the first module was initially accessible to the user and the later modules were locked. After the completion of all sections in a module and a 4-day gap since its unlocking (to prevent rushing through the modules), the next module was unlocked. Steps within a module were also unlocked gradually upon the completion of the preceding steps. Each participant had a maximum of 90 days to complete the 6 modules starting from their first log-in. After 90 days, they could continue to use the modules that were already unlocked until then but could not unlock new modules. We did this to restrict participants’ exposure to new therapeutic content after 90 days and provide a clear deadline, as recommended by several studies [