What you see here is a learned endeavor with a puppy. Lindsey is teaching the puppy to stay engaged. She is giving the puppy reasons to want to be with her and to want what she has.
When a trainer can get their dog to be this engaged with them, they have a dog that is ready to start to learn more advanced exercises. When you stop and think about it, if a dog is not engaged or it doesn't want to be with it's handler or it doesn't want what it's handler has, then how can anyone teach that dog an exercise? The only answer to this question is they can't and the only way to train a dog that is not engaged is to use force in the training.
Lindsey was one of Michael's first students at his school near San Francisco, California. She has studied Michael's system and has become an instructor in the school.