ABSTRACT
This chapter defines the key terms of this book. Concepts related to migration, physical activity, and crisis lie at the core of the topic analysed. To allow the reader to better understand the present discussion, these concepts are introduced, explained, and delimited from and related to each other. Because many of these words are politically charged and used with dissimilar meanings in different social context, the chapter provides also critical reflections and insights in the social phenomena beyond them. The theoretical implications of the definitions, which are borrowed from existing glossaries and scientific literature, will be discussed in detail and further deepened in successive chapters.
