This chapter explores the subjective health concepts in family therapy trainees (FTTs) in a systemic family therapy (SFT) organizational training setting in which individuals study to become certified family therapists (FTs) within a 3-year training period. Subjective health concepts and their development within organizational contexts are studied. The aim of the chapter is to contribute to a discourse on the development of subjective, personal health concepts and their impact on the development of a broader organizational culture of health and wellbeing. The chapter is based on a longitudinal hermeneutical case study design. The sample consisted of 65 FTTs, enrolled for a 3-year training course in SFT to become future FTs. Questionnaires were used to collect data with three measurements, one measurement per year of the FTTs. The data was analyzed through content analysis. The findings show that subjective health concepts of FTTs changed over the 3-year training period with regard to perceptions on aspects that support health and how professional health is conceptualized within the organizational training context. The development of subjective health concepts has implications for the FTTs' work and their perceptions, attitude, and behavior in therapeutical work contexts. The findings provide further insights on how subjective health concepts develop in professional FTTs, who work within social and therapeutical organizations, and how this impacts on the broader organizational well-being. The conclusions indicate how subjective health concepts and organizational well-being relate and recommendations for future theory and practice regarding the development of FTTs' health concepts on a personal and organizational level are given.