The back feet on the target is what we are working on....I'm using one of the fitpaws
discs. Challenging for Karlo's long body, but he really does work his body and brain doing these exercises. The peanut we're using is the yellow one, and fits his 100# structure really well. My trainer is providing the equipment, not sure where she got the yellow one but I think from here:
PhysioRoll Exercise Balls - Peanut Balls
It's really durable & thick.
We go outside and romp/run in the winter too, but these exercises work different areas of the body, the abdomen and thighs~doing the upsits and down/backs aren't in a dogs normal movements so it does give a bit of a workout.