I've always said "strides", as in: "I'm gonna do 6 x 100m strides after my long run." Some people say "striders." What's up with that? Is it a regional thing? Seems to me that a "strider" is "one who strides", no? E.g., whilst DOING my "strides", I would technically BE a "strider." Oh well, tomayto-tomahto, I guess. Which one do you use, and where are you from?