Football. if you could change one rule.
I find football has become boring to watch in recent times.
I would change the rule around restarting after a goal is scored.
No half way line kick off just let the keeper restart from where the goal was scored. To much kissing and cuddling after a goal has been scored and lots of time wasted.
It would make it more exciting. Keep a ten second rule for celebrating after which keepers starts.
Soon put an end to that shyte which spoils the game. Save all that for the end of the game...
That would be my change.