I love Zak George. If you don’t know him then you should check out his channel on youtube. He has a different approach to dog training than most dog trainers right now. His methods however are actually “old school.”
Anyway, in the discussion of excercising your dog he challenges us to go further. He says, walking, playing with other dogs and even free running (such as in your back yard) may not be enough for your dog. Now, if you have a couch potato breed like my Cavalier then you are probably home free, but if you have a lively breed like a Jack Russell Terrier or a Doberman Pinscher then you should take a look at this video.
Let me know in the comments what you think of Zak George and how you meet your dogs fitness needs.