I think I’ve heard there is maybe a problem with a girl horseback riding or is that baloney that somebody made up?
oomis- the Bais Yaakov girls where I grew up were not allowed to ride bikes or rollerblade to school. It was definitely considered not tznius. A lot of girls did not ride bikes or rollerblade at all in the street although a small minority did. Girls over 12 used to go bikeriding or rollerblading on specific bike trails that were more secluded. I am not sure what you mean by Yeshiva girls.