The training that I've been doing is having them get on the wobble board and do position changes while balancing. So from stand to sit, sit to stand and then crossing paws in stand. We've been doing this a couple of times a week.
As you can see in the video they are very excited to play with the wobble board. Phoenix was previously afraid of anything that moved under her feet so she's come a long way!
Eventually I will be adding the sit pretty. Neither of the girls are very comfortable with it yet, though.