*2.1. Overview and Employer Context*

This study was an extension of a partnership with a labor union and several regional grocery store chains who had participated in a preliminary study examining workplace factors related to health behaviors and obesity [33,34]. Upon completion of that study, we approached our partners about piloting the HWPP in one store. We explained that the goal of the program was to develop and implement health and wellness initiatives to promote health in the workplace setting and support workers' efforts to make positive health changes; one of the grocers agreed to participate.

The study period was from September 2014 to June 2016, during which time we piloted the HWPP program, collected process measures, and collected baseline and follow-up worker assessments by surveys and focus groups. The Institutional Review Board at Washington University approved all research activities and all participants provided informed consent.
