BTW, one of those trainers in that link is my LEAST favourite trainer ever (Kikopup). But she DOES make some good points in her video, though the average person would find her rapid fire clicking and dispensing of treats difficult to do.
However, I don't see the sense in stuffing a treat into a pup's mouth to keep it from biting. What if you don't have one available? The pup wants to play, not eat! Use a toy instead, and move the toy to stimulate the pup's interest in it as opposed to your hands or feet.
You have a young pup, that has likely been alone for awhile while you were at work or shopping, and you want to teach it to be CALM? How about letting it burn off some energy first by playing with toys, THEN when it's tired, work on the 'calm' bit? The Michal Ellis video is much more appropriate for a high-energy pup!
Edit: the video below Kikopup's say the 'ouch' method doesn't always work, and can actually make things worse. So, some people agree with me!
It's often said in dog training that the only thing two trainers can agree on is that the third trainer is doing it wrong! One of the reasons for this is what works for one dog doesn't work for another. There is no one formula for training that is going to be universally successful. The techniques I would use to train a 10 lb. lap dog are much different from what I'd use on an 80 lb. German shepherd. The lap dog may cringe if someone raises their voice. The German shepherd working dogs, when being trained for schutzhund and police training, have to be able to take hits with a stick, and not let go of the decoy's padded sleeve.
You have to train the dog that is in front of you. Also, pick a trainer that is familiar with your particular breed of dog. All-positive trainers may work for smaller breeds, but many German shepherds need to be told 'no'!
