is Ballroom Dancing a sport

Don't know, but trolling obviously is!

Well actually, there are champion sumo wrestlers that hail from the asian countries, and I suppose you could call some of them overweight. If you do, just don't stick around for long, or you may not be dancing for a few weeks

But otherwise I agree that dancing is a sport when taken to the competitive level. About any sport I can think of has a set of rules and guidlines to 'play'. At the competitive level the rules are subjective baised on the patterns and judges.

Social dancing could be compared to a pickup game of any sport, people are more interested in enjoying themselves on the floor than concerned with how they look and the technicallity of the performance.