I'd get/make a seesaw of some sort. It's a piece of equipment that many dogs take time to get confident with because of it moving under their feet, and you can use it to train contacts too. It doesn't have to be full size or expensive, a plank that's long enough and the right width that's able to tilt over any fulcrum should do. You see a lot of beginner dogs in competitions who are very anxious about the seesaw and refuse to do it, get a step ahead of them!