I often think that getting a behavior is relatively easy, but having duration to that behavior can be immensely difficult. I can't remember when I stumbled upon the principle of reverse luring but the discovery of the training technique has made getting duration much easier! I believe Fanny Gott uses the method and/or some other European trainers, but I haven't heard much of it. Before RL I was stuck with pure shaping, selecting the reps where the time was just a half second longer than average.
Reverse luring is similar to It's yer choice and doggy zen in that the dog has to make the choice to move away from food being held as a distraction. But RL also is a feedback system for the dog in that it can communicate as a keep going signal and as a no reward marker. An open hand=the dog is correct, a closed fist=try again. Sometimes I will also remove my hand when the dog is wrong, but I'm not consistent in that use and I'm not sure if that was part of the original technique. As a proofing method in later steps, I also use RL to cause the dog to think harder about the behavior and resist moving towards the food. I do this my starting to move my hand with the food around the dog. In some cases I will start the RL before the dog does the behavior such as having my treat hand held out in my right hand when I ask the dog to move to heel position or held out in both hands when I ask the dog to front.
Because there are scarcely any videos on youtube, I decided to make my own showing RL being used to teach 3 behaviors.
1. A chin rest to a chair (eventually used as a "go visit" another person command and also useful for teaching a dog to rise and drop an item onto a counter.)
2. A hold as the last step in teaching a retrieve
3. Calming da Bubba. RL was used a lot with him to get rid of his spastic behavior in shaping :)
Update!: I've gotten some feedback that people are confused about the difference between reverse luring and proofing. The answer is reverse luring can be proofing, but that proofing isn't necessarily reverse luring :) I use RL in order to TEACH the concept of duration and in later steps I can use it as proofing in order to further a dog's understanding. For example, with a dog who understands dip head to the floor but has zero understanding of keeping it there, then RL can be the perfect way to get duration through the feedback system it provides to the dog. I wouldn't really consider this proofing because the dog doesn't understand the concept of duration, yet. But once the dog does understand that keeping head to floor is what gets the treats, then this can morph into straight proofing. You can see this later step in the video by me starting to move my hand with the food so that the dog now has to concentrate even harder on the task at hand. I hope that helps!