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. Long before sports leagues around the world were abruptly put on hold, and centuries before they were founded, Mesoamerican cultures were having a ball on courts of their own. The Olmecs, Maya, and…