Crawling, jumping and clapping are all likely to make your dog break a stay, so proof for them. Occasionally give a new position command, to make sure they’re still listening to you.
Walking around, skipping, getting down on the ground; all of these things will tempt a dog to break their stay. Practice with your dog or they won’t stand a chance.
If you want your dog’s stays to be reliable, you need to practice them. Slowly introduce distance and distractions to test your dog’s stays. Pay constant attention and use lots of feedback to keep them in position.
Slowly build up more distractions, duration & distance. Make sure they understand that their stay continues even if you’re moving around, or petting another dog.
As your dog gets the hand of staying, you can phase out the running commentary and introduce more silly behavior. Go slowly and increase the challenge a little bit at a time to maintain the momentum of success.