Where can you compete in quite a practical activity?

The text describes "Extreme Ironing" as a sport where participants iron shirts in dangerous places like mountains or on ice/water. While it's a competition, it's not described as a practical activity in the general sense. The Cooper's Hill Cheese-Rolling (section C) and Races on heels (section F) are also not practical. The climbing palm trunk (section E) is a competition but not necessarily practical. Humans are competitive by nature and enjoy any activity (section A), but no specific practical activity competition is highlighted as such. Therefore, this question might not have a direct answer in the provided texts.

Answer: No direct answer found.