Cross-Country Cycling, which is said to be a modest trend these days (actually, it's been popular for a while)

Source: Women's Generation (a priori)

It seems to be enjoyed by a wide range of people, from young adults in their 20s and 30s to middle-aged and older adults. You can often see foreigners while traveling along the cross-country cycling paths.

https://youtu.be/1TT4bvN1afY?si=y7bP2BSqeJ42egn0

https://www.youtube.com/watch?v=1TT4bvN1afY

https://youtu.be/FJVm-SSrJak?si=3pdvTLcLv-U1EYN0

https://www.youtube.com/watch?v=FJVm-SSrJak

There are certification centers located at intervals along the cross-country cycling paths, where you can get certification stamps.

Source: https://cafe.daum.net/subdued20club/ReHf/5660700