
I have a nagging feeling that while some folk are genuinely naïve and don't know that young pups should be limited in their exercise...
...others may have heard the word from a certain TV trainer who argues that Exercise, Discipline and Affection are the way to go, without any disclaimers that this isn't what suits puppies and young dogs.
Add to that, you have a puppy that's bouncing out of its skin on a daily basis; human instinct is to take it out and tire it out with physical exercise.
My personal mantra would be Training, Affection, Exercise... because you can do an awful lot with mental workouts for dogs, and if it is done in a positive manner it will increase the bond, as well as tiring out the puppy without overdoing anything.