I found something that I am worse at, and is more publicly humiliating for me, than mountain biking: zumba.
The above video shows what my class was like, more or less. My MIL took me along and we looked nothing like the folks in this video. You'd better believe I would never have agreed to do it in front of an audience (or in that "shirt").
I only wish I had Mike Perlman's guts, or his moves. If you have ever seen me dance, you know I have the rhythm and coordination of the Perry Mastodon.
However: at least with zumba I am not risking my life: