This chapter elaborates on the approaches, methods, and key concepts used in the research. This chapter goes more deeply into the details about the book’s chosen approach and research methods which have been adopted from modern matriarchal, Indigenous, and archeomythological studies, something never before applied to sauna research. The book brings together, at the same time, the author’s life’s work as it has focused for decades on the links between saunas, sweat lodges, and the bear religion. The notion of proxemics is defined as a useful tool for clarifying the architectonics of space as a semiotic system, relevant also to different saunas in terms of their structures and spiritual or ritual meaning. The notion of proxemics has to do with the study of intentional human use of space for symbolic meanings. The notion is relevant to all of the sweating ritual studies just as they fit the task of comparing architectural arrangements of the Big House among the Delaware. The obvious ecofeminist approach is to revisit patriarchal history for its gendered biases and exclusions and to complement the research in this field with what we know of the past through the lens of indigeneity and gender. In this chapter I elaborate on the different gendered notions of spirituality as part of a deeper and broader worldview and life ways. After having provided an overview of the theories of the spiritual and of the sacred, I apply their relevance specifically to the sauna as a matrix of rebirth and healing. The issue of appropriation is, on the other hand, relevant to any comparative study touching on Indigenous peoples and their sacred rituals. Hence my self-reflection on how I came to include this perspective and how I have sought to avoid the politics of unconscious or even well-intentioned cultural appropriation. In this chapter I also elaborate on different terms for the sacred from sanctus and spiritus to holy and Hel contrasting various historical and contemporary definitions within religious studies. The terms themselves reveal the subjective and constructed nature of spiritual terminology. I also refer to the Finnish notion of väki, a particular strong energy charge linked with women and bears, which becomes relevant in the following chapters on different types of primal saunas and a protective life force rooted in female sexuality.