Some people think you need a shortboard to windsurf fast. This is not the case, as demonstrated by these Polish windsurfers riding the Mistral One-Design longboard. This is the board that they used in the last 3 Olympics, before they switched to the shorter, wider RSX board.
If you notice, they are riding the board in two ways. When they are really ripping and jumping they are in the back footstraps with the daggerboard folded up inside the board. However, you also see them sometimes going quite fast with the daggerboard down and their feet in the "railing straps" further forward on the board. The high level of performance possible in daggerboard-down mode on a longboard is often overlooked, but you can see it illustrated even better in the next video.
Cool, huh? Now get back to work.
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