For an ASB time travel to 300 BCE TL:
Would trying to explain an offsides-free version of football/soccer to downtimers be relatively easy? How would the game evolve without the offsides rules, particularly in a downtime setting?
By opening up the game, physical conditioning will be even more important, but what would the impacts to a sport and its leagues in infancy to what is bound to result in a much higher-scoring game, particularly in an ATL of extremely varying technology. (Neolithic Era meets Atompunk).
An sport rule are always how happen in real time, make people play and make sure the referees get when,how and why mark the respective fouls, it might take a while but people would catch it as otl, specially in football-soccer as was heavily visual and easy to play, so not much different as teaching referees in otl.