" Many owners think they can substitute taking a dog out to play fetch for giving him regular walks. That doesn’t work. Yes, it’s exercise, but not the kind of primal activity that migrating with a pack leader provides. I like to compare it to taking the kids to Chuck E. Cheese’s versus taking them to piano lessons. Chuck E. Cheese’s will have them bouncing off the walls. That’s excitement. Piano lessons will be a psychological challenge. That’s calm submission. Playing catch is excitement; a walk is calm "

― Cesar Millan , Cesar's Way: The Natural, Everyday Guide to Understanding and Correcting Common Dog Problems