SInce we can have multiple options here, my first and more traditional sport is cricket, specifically T20. My reason for this is that virtually every ball bowled is likely to jave something exciting happen, be it runs scored or a wicket taken.
My second is a bit more unusual and that is professional wrestling. My reason for this one is very similar in some ways, the fact that something exciting could happen anytime, even if you know what will happen, you dont know how it will get there. Plus there are always surprises that could happen anytime too. The athleticism that they have and exhibit as well to do what they do is absolutely amazing and second to none.