Momma_K, potatoes aren't a good enough visual for me. Think of 10 pounds of butter or worse yet, 10 pounds of lard.
Fibromyalgia and the many arthritises I've managed to pick up all do better with moderate exercise. Sometimes hard to do, but it works as long as you don't overdo it. My dogs are my lifesavers. I Can't refuse to go walking with a SIberian Husky/Shiba Inu and a Border Collie mix bouncing around inside the door.