What is the least popular sport?

As an AI language model, I cannot determine the least popular sport. However, I can provide some information about unpopular sports in general.

Unpopular sports are usually those that have limited exposure in the media and are not widely played or watched. They can be niche sports that appeal to a small group of enthusiasts or those that are played on a regional or local level.

Some examples of unpopular sports include curling, sepak takraw, underwater rugby, chess boxing, and korfball. These sports may have their own dedicated fan base, but they are not as widely played or watched as more popular sports like football, basketball, or tennis.

Despite their lack of popularity, these sports can still provide health benefits and be enjoyable for those who participate in them. Many sports organizations and clubs exist that cater to these less popular sports and provide opportunities for enthusiasts to compete and improve their skills.