I was checking out Steve Bodner's racing blog from the Midwinters when I came upon this photo of race boards. Check out the inboard rear straps on the Mike's Lab board, and the single center strap on the F2 (someone taking that thing out into the waves?) The Puffin inquired.
"The center straps in the formula board are for the downwind legs when it gets crazy" Steve told the Puffin. "By putting your foot more in the centerline of the board you take pressure off the fin and get more control."
I did not know that...but it makes sense.