There are a lot of high quality assy fins out there to choose from that are tried and tested from manufacturers like Gasoil, Z fins and F Hot so you pays your money and you take your choice. But I highly recommend that you try them before you go to Lüderitz. Its not the place for fin testing, if it goes wrong it can get real nasty, real quick!
On a personal level getting a fit as possible for this event is very important as it is with most high-end windsurfing competitions. The difference here is you may only be on the water for 20 minutes a day, if you’re lucky, but those 15 to 20 runs that last less than a minute, will be the most intense windsurfing you will ever encounter.
Most of the top guys and girls are carrying 6 to 20 kgs of weight to carry them through the lulls and stop them getting lifted in the gusts and you are water starting a board only just wider than your foot and with less than 55 litres in volume with a relatively small sail in very strong gusty winds and that is before you have even got to the start line. So a combination of heavy weight and flexibility training together with good core stability is required prior to getting there and kept up with on the non-windy days in Lüderitz. So when you need it on that big day and it all starts to rock and roll you’re not left wanting and disappointed.