how is chess a sport?

One can redefine the terms as one wishes, but personally I find it hard to consider "sport" an activity that consists of staying glued to a chair for hours, almost motionless, whose only muscular effort consists in moving small pieces of plastics of a few grams, or a mouse.

I would say rather that those who practice chess at a competitive level do so with a sporting approach similar to that of those who practice proper sports.

I'm not sure but I think it was Dick Cavett discussing with Bobby Fischer the stamina it took to play a serious game of chess and Cavett made the comment that a boxer's legs were the first thing to go and then asked Fischer what the first thing to go with a chess player? It wasn't his legs.

Yes, after 5 hours of playing a chessplayer certainly feels very tired even on a physical level, but in my humble view this is not enough to define chess as a sport.

Cavett was making a joke about it.

Chess is the best sport

Nowadays trolls are using "Troll" in their name? That's useful.

Did somebody say trolls?

Hello!

The chess players from Russia are subject to sanctions by the World Anti Doping Agency, which has authority over athletes. In addition, chess is an associate sport of the Olympics. Therefore chess is a sport.