I like to joke that if we had started as a puppy, Lexi would have been better at flyball. She has drive, she loves to go fast, and it doesn't require nearly as much focus (or deceleration!) I'm certainly not saying flyball is easy, but it seems to play more to Lexi's strengths.
Anyways, a friend of ours is a flyball instructor and let us borrow a hit board for fun. I don't think we'll ever seriously compete or anything, but I think Lexi would enjoy it, and it gives us something to practice in the house when it's raining!
Here's a video of her first couple tries on the hit board.