Yes, it's real. The name is "Stadium Events" and the USA version of this game it's extreme rare and valuable.
Why? because if was a few copys in the marken with the name "Stadium Events", the regular name of the game was "Family fun fitness".
So, if yo found a extremely rare and very few unit of this game, literally you've gold!
the question is, you'll sell it? or keep it as a NES collector...