With gyms, pools, and spin studios around the world temporarily shuttered, it can be hard to find ways to exercise the way we used to. Atlas Obscura is taking this time to look back at different groups from history, to see what lessons they might have for working out in ways that help us maintain social distance. In feudal Japan there were few folks you’d want to cross less than a samurai. The military nobility of the country’s Tokugawa period were equal parts martial artists and state representatives, serving as…