i just finished travelling for six weeks in some remote parts of china.. and i got so worried about lacking trailwalker training, i ran up and down many times on the 后楼梯 of the 五层 hotel for practice, since it's better than nothing. i didn't dare tell any of my travelmates, since they may think i am insane. haha... don't know if i "enjoyed" it, was really tough actually as there was not much ventilation in the backstairs. and after a while it seems to be the most pointless thing in the world. but oh well!