1. Chess does not involve physical exertion. (Please don't say a bunch of crap like "Chess players burn so many calories, expend so much energy while thinking", etc. Those are examples of mental exertion, not physical
2. Live chess is not entertaining to watch. Waiting for a player to make a move in classical chess takes a great quantity of time, even more so than waiting for a baseball player to stand up to bat (or changing sides after innings or whatever the complaint is about baseball being slow, there's many), which is generally described as one of the most boring aspects of any sport. Analyzing the games after they have completed can be "fun" if that's your kind of thing, but live, classical chess doesn't provide any sort of entertainment while the match actually occurs (for the vast majority of people, there are always outliers but I don't understand the thrill of watching people like Radjabov for multiple hours just to watch a Berlin draw)
1. Moving pieces
2. People find it entertaining
2. Live chess is not entertaining to watch. Waiting for a player to make a move in classical chess takes a great quantity of time, even more so than waiting for a baseball player to stand up to bat (or changing sides after innings or whatever the complaint is about baseball being slow, there's many), which is generally described as one of the most boring aspects of any sport. Analyzing the games after they have completed can be "fun" if that's your kind of thing, but live, classical chess doesn't provide any sort of entertainment while the match actually occurs (for the vast majority of people, there are always outliers but I don't understand the thrill of watching people like Radjabov for multiple hours just to watch a Berlin draw)