Here's a simple video showing how I'm working on Lyra's retrieve over high jump.
She knows how to fetch. She knows how to jump. She knows how to stay. She has a reasonable clue about fetching over a jump in the outbound direction, but definitely shakier about the return.
Now I'm focusing on proofing the return - teaching her to find her way back to the jump when the dumbbell is off center. To accomplish this, I use "obility" and substitute an object for a dumbbell. This allows many more repetitions and I can keep her enthusiasm up since there are no "stay", "front" or "retrieve" components to worry about. The more I can isolate the issue, the better my chances of success.
I do need to work on her front with the dumbbell. Had it for awhile but guess it's lost now.