For those of you not comfortable with this innovation consider how you learned most of what you know. If it is baseball, you pitched, cached, fielded, etc, before you played the full game. You learned addition and subtraction before you were exposed algebra. Why not separate the windsurfing skills that lend themselves to transfer from the beach to basement? After some practice (even in winter) you go to the beach making it just so much easier to integrate your learned balancing skills and weight handling skills and mesh them with wind conditions?