Learning to kiteboard involves developing two skills at the same time: flying the kite and controlling the board. If you have one skill down already, then that's one less thing to worry about in that steep learning curve. Any board sport will help but by far the best one to prepare for kiteboarding is wakeboarding (behind a boat or at a cable park). This can save you hours of hard work! If you go practice on a wakeboard, be sure to practice riding with your "other foot" in the forward position as you will need to learn to alternate when changing direction with a kiteboard.