This is a video of a training session with my puppy Cloud. We are working on teaching him to only get up when he hears the verbal cue "Free".

Here is Mary Hunter's wonderful article on building duration:
https://behaviorexplorer.com/videos/duration-behavior-chain/

Here is my 2010 video on teaching a stay using the Kikopup Method:
https://www.youtube.com/watch?v=Vk4PPcE1CqY

Here is a video that goes into more detail on teaching a stay using a release to a plate with food on it: https://youtu.be/0hcRZEYSARs

Here is a video compilation of some of my best how to train and proof a dog to stay in a sit down or stand videos: https://youtu.be/A0fWfSAvan8