​Demonstrating health disparities related to race, age, and gender, older Black women (BW) are the most sedentary demographic group in the United States. Increasing PA in mid-life is important, as it improves health as BW age into their later years. Advancing our understanding of the exercise motives of BW triathletes presents a reverse engineering opportunity to identify motives that could influence sedentary mid-life BW to increase their activity. The purposes of this study were to: (a) utilize an innovative survey transformation method to adapt a measure developed primarily in Caucasian males, i.e., the Motivations of Marathoners Scale for Triathletes (MOMS-T) into a qualitative interview guide for use with BW triathletes; (b) use this interview guide to identify culturally based motives for triathlon participation among BW not previously addressed by the MOMS-T and; (c) interpret the novel motivational domains of the MOMS-T discovered, in order to gain understanding and influence subsequent interventions. Purposive sampling was used to select 12 interview participants from 121 self-identified Black female US residents aged ≥36 years with recent experience completing or training for a triathlon. The interviews identified four culturally based themes, including improving body composition to become more lean, physical attractiveness, triathlete family, and camaraderie. These novel themes were related to existing MOMS-T scales, but the current MOMS-T questions did not illuminate their culturally distinct aspects. The process of survey transformation provides a viable approach to identify important culturally based characteristics and to adapt surveys to cultural minority populations, particularly when study resources are limited. ​