Windxtasy said..
... If you can wiggle that foot backwards so you can feel the strap next to your foot then you can move that foot into the strap without looking because you know where it is. You must be quick.
...
This is pretty much it.
Once you know exactly where the strap is by having the side of your foot touching it then it's just a very short fast movement of the back foot outwards, slightly back and then inwards again, without looking.
If you have to look then you are already half way to losing it.
You end up balancing on the front foot while stabbing away with the back foot and folding over the strap so it's impossible to get your foot in anyway, and at the same time, weaving this way and that as the balance point changes ,until it all finally falls in a heap with you and the board upside down in the water.
All good fun but not really the objective of the exercise.