Just read this WaPo review of Natalia Petrzela's book on American fitness culture: https://www.washingtonpost.com/books/2023/01/05/fit-nation-exercise-culture-petrzela-book-review/
Now I'm looking for a comparative history of class, nationhood & sports. Does this exist? I'm most familiar w/ the German case, where the development of athletic *culture* runs partly through people like Turnvater Jahn, and the development of athletic *associations* is inseparable from early-20th century working class sports/leisure clubs. (Nur der BVB!)