This is a device used to make ankles more flexible. Read about ankle flextion in swimmers and you will find that the people who have been doing it a long time have very flexible ankles. I was a runner who became an elite triathlete and this thing really helped. I took it with me to Australia when I raced down there and guess what, I swam fast.
Read more here. http://www.zoomers.net/rack.htm
I have pics of the one I am selling. $20
email me mcooke79@hotmail.com