Jogging Backward on the Treadmill

I had to google this up Vach...coz I was pretty amused when I heard of it yesterday ..

I was hoping to be met with "this is aerodynamically not possible" or something...

So for all those who want strong ankles and a toned "posterior" ...here goes..

http://walking.about.com/od/treadmillworkouts/a/treadmillback.htm

PS:Sash..toned "posterior" ???