What is a rare hobby?

Uncommon Hobbies

Some of the rarest hobbies, such as corrosion casting, extreme ironing, and blood painting, attract only a small number of enthusiasts. Corrosion casting, which involves creating models of blood vessels from resin, along with blood painting, can be off-putting for some due to their graphic nature. Meanwhile, extreme ironing requires a combination of athletic ability and a taste for adventure, making it uniquely challenging.