Most definitely winter sports (except for ice skating which is getting more popular)
Chess
The least popular sport is volleyball i checked 100 sites no lie x
The least popular Olympic sport is football.
marbles, which is actually a sport
basketball.
The most popular sport is football, a.k.a., soccer.
Generalizing would be wrong. Every country has a popular sport and an uncommon (even obscure) sport.
probably basketball
probaly cricket
Bowling
Seal clubbing.
cricket :D