Koira thinks dock diving is the best thing ever. She had a blast doing her xtreme air practice (which is simply a long distance jump with a running start). This time, we also started practicing XV, xtreme vertical, as well. The goal is for the dog to jump off the dock up and out and grab a stationary bumper before dropping down into the pool. XV is a separate competition from XA, but I think a dog learning XV can help them jump farther in XA, since it can teach them to follow their thrown toy up and out instead of straight out. And if they get a higher arc in their jump, they get more air time, and hence, more distance.
Koira is probably never going to be a rockstar with XV, but she had a lot of fun and was doing really well with her baby dog version (where we had the bumper both lower and closer to the dock than the lowest competition setting).