Finswimming

I was intrigued by the description of finswimming in a recent article about Misty Hyman on the USMS home page. www.usms.org/.../articledisplay.php Of course in this age of Google and Wikipedia it is easy to find information about anything but I was curious if anyone on these forums has trained for or participated in fin swimming events (or known someone who has) and what their impressions were.