About 4 of the girls down at the windsurfing rigging area do yoga religiously, maybe 3+ days a week, and 3 are pro instructors.
They can't windsurf worth beans compared to me, stiff as a ....stiff.
Increased flexibilty means you have more flexibility, not that you can do anything better than anyone else.
I used to laugh at the surfer's all doing yoga before their paddle outs. I was surfing 4A then, and never stretched or warmed up. Heck try putting on that 4/3 wetsuit, booties, and waxing your board. I was ready to go after that.