Study design
A detailed description of the study design and methods are presented elsewhere [Eligible participants were computer block randomized (block size = 4) by stratum into one of four treatment groups for a 12-month intervention to evaluate the independent and joint effects of a 2 (adaptive versus static goal setting) x 2 (immediate versus delayed reinforcement) factorial trial to increase accelerometer-measured MVPA. As such, the factorial intervention was nested within an observational design of the built environment to evaluate interactions with walkability on MVPA. This study was approved by the institutional review board at Arizona State University and was prospectively registered with ClinicalTrials.gov (NCT02717663).