Ladies, ladies, we've got it all wrong! Skip the bikes, skip the running and swimming and crosstraining and what-not, and try the new exercise regime guaranteed to put a smile on your face. Or on the faces of those around you, at least, if they can pull their jaws up off the ground:

http://prancercise.com/video/

I'm suddenly reminded of what I must have been like when I was about six. "Mommy, mommy, look! I can gallop like a horse!" "Mh-hm, very nice dear." "Mommy, mommy! Now I'm trotting, look!"