We need to show our dog that we are not predictable (even though we are!) Remember they know it before we do it, the little stinkers are so darn smart. They will know that you have three treats in your pocket and you only gave them two. They will know when its time to eat, or someone comes from work or school. They have an amazing biological clock that associates every little detail down to even what you are wearing.
So mixing up being random with what you ask, their sitting, laying or standing is very important. Standing is still something that they do all the time, but so many have a hard time teaching it. They just don’t think it is a “command” as it is a natural behavior for a dog. Well so is sitting and laying. We just want to avoid the dog that anticipates your next command or sequence. We tend to say sitting, then laying, well maybe say it backwards, ask for laying then sitting! This is super hard for puppies to do. Mix it up for them, keep them guessing, as it keeps their focus up too!