From a comp perspective ... I think it's crucial that the dog believes this can happen not only during training, but during TRIALING as well.
Absolutely. Totally. My last dog "believed" and would punch me with her nose. We used "trial markers" (like a ball ALWAYS delivered after the second gun shot, a ball ALWAYS delivered when the other person on the field said "Platz" when they downed their dog for the long down, a ball ALWAYS delivered after the group (fuss! Thank you Group! BALL), Always at certain times a ball appears. We do train like we trial.
It's like the old adage "trial the way you train". Not as though you're truly going to break out a stick in the midst of being judged, but you want the dog to believe that it's possible. All too often, and PREDICTABLY, handlers change their typical demeanor as soon as they step into the ring or onto the field. An air of absolute seriousness suddenly comes over the environment, and it can sometimes affect engagement. And therefore, quality of performance and scores.
Trial nerves can kill you. No question about it. I see it. We actually DO practice for that silence and duration and stiffness. It happens. Humans are the weak link.
Ie: when we do fun matches, I'll try my best to approach it as if it's an actual trial. Essentially formally. However, I might occasionally get down on my hands and knees for a very brief moment between exercises and PLAY with the proverbial stick, right in the middle of the ring. Because this is EXACTLY what we do during training. Embarrassment be damned. I want my dog to believe it can and MAY happen on trial day.
I do go to AKC Ob matches and do this but that is VERY VERY different than an IGP obedience routine. Mostly I do the Ob matches so that we can be in a distracting environment. The criteria for Ob in AKC rings is very different than IGP (although I encourage people in AKC ob to work some IGP stuff because it really does "up the game" a LOT for their AKC routines).
One advantage (and also a disadvantage) is that in IGP we have the same heeling pattern every time. The advantage is using trial markers. The disadvantage is that it is always the same so we cannot be the same.
The AKC routine is called out and (once you hit CDX level) is not always the same sequence and has no send out until Utility (we do heeling, group, retrieves, send out in that order always). The advantage is the heeling routine is NOT always a J and the exercises are called out so it gives the IGP dog a lot different picture. I do the IGP about turn (always causes a tizzy in AKC matches and sho n go situations). Some things in AKC routines I will never do (drop on recall is one since fast recall is very important in IGP).
FWIW I love the idea of getting down on the ground but with a replaced knee and soon to be replaced hip I cannot do that quickly enough to make it effective (although I am sure it would be a crowd pleaser! Haha). I DO step off to the side suddenly if I lose attentiveness and then go right back into heeling and the instant I see perfection I reward it and really play to make the right thing important to the dog. Any time during the routine (and here is where working on NOT being predictable counts) when there is "brilliance" (the dog.. don't look at me for brilliance.. ha) I make it a party. This dog REALLY amps up very very nicely for those moments.
It is a work in progress. Or rather, I am a work in progress. I am just looking for different things that might be valuable to our routine (which I try not to make a routine.. more like pieces of the trial picture thrown in here and there).
We also do NOT always train. Some days it is neither AKC matches, IGP field, tracking or protection (we do heel and do obedience for bites). One day next month we are signed up to do some beginner dock diving. Other times it is a walk in the woods. Sometimes it is retrieving in my pond (swimming is so good for the dog!). Sometimes we play with two jolly balls on the back lawn (and I incorporate those into training too).