I just noticed this smiley. It really bugs the crap out of me, even though, I know it doesn't have to make sense ... it's a frggin' smiley. BUT, the physics of the supposed movement forward can not occur if you have a round body, with no keel, and alternate your strokes. You must use a both sides combined, simultaneous motion that pushes your center of gravity forward. Otherwise you will just alternate half turns in the same place.
Sorry, carry on!