I have noticed an overwhelming predominance of males in the vast majority of hobbies, and I have been wondering why. Typically you go to, like, a tournament of some tabletop game or something, and at the very least 95% of the participants will be male. This is true for almost all other hobbies as well.
In some hobbies the distribution may be slightly more equal. For example this is often so with many sports.
However, I have been wondering for some time now if there's any hobby or sport where the distribution is reversed, iow. the overwhelming majority of participants are female. And I'm not talking about hobbies that have traditionally been deemed extremely "girly" (like knitting or ballet), but something that has no such historical cultural burden, nor any obvious reason for it to be so female-dominant.
After years of wondering this, I finally stumbled across such a thing:
http://en.wikipedia.org/wiki/Roller_derby