A fun activity that I am incorporating into our training routine is using the balance ball. I bought the above Fit Paws "ball" (it's really more like a flat oval) and the dogs love it. I ask Cosi to "spot" which means to put his back two feet on it and the front two feet on the ground (just like at the dog walk). Mike is really getting the knack of getting on and standing up. It's a great confidence builder. Jenny can get on, but not to keen on staying on just yet. More like, "There. I did your stupid thing. Now hand over the treat!" LOL
It's a fun exercise, works their core, and is a nice transition to shaping for other behaviors. Do you use a balance ball?