Workplace health promotion (WHP) may be an appropriate way to support women with a low socioeconomic position (SEP) during midlife. Little is known about reaching and engaging women in WHP, particularly not at the intersection of midlife, low SEP, and ethnicity. We initiated the ProudWoman project, in which we implemented a WHP intervention aimed at supporting midlife women as a pilot in an academic hospital. We qualitatively evaluated the implementation using the RE-AIM framework. The pilot comprised multiple steps: tailoring the intervention to the needs of ethnically diverse group of midlife women with a low SEP, developing an implementation protocol, implementing the tailored intervention, and evaluating the implementation process. The main findings of our study are: (1) due to a wide range of recruitment activities that were actively deployed, we were able to "reach" an ethnically diverse group of midlife women with a low SEP; (2) regarding "adoption," awareness of the relevance of this topic as an occupational health challenge was not self-evident at the organizational level; (3) according to our participants, various facilitators and barriers should be taken into account in the "implementation" of the work-life program; and (4) our focus group discussion revealed as "maintenance" is relevant to these levels in different ways, awareness of midlife and menopause as an occupational health challenge should be raised at four professional levels. We conclude that elements, such as an active and personal recruitment approach, are important in the implementation of WHP for ethnically diverse midlife women with an SEP.