Jennifer Crank says:

Sarah beat me to the punch regarding the markers demo video (we also have a podcast talking about them) but I will answer your specific questions about this video.

The two different verbal cues are just to differentiate the reward placement. “Take” is food from my hand and “find” is food on the ground. This information gives the dog a very clear understanding of where the food will arrive from and therefor improved clarity in our communication. I never want my dog to be looking for food on the ground unless cued so it is important to me to ALWAYS mark when I am tossing treats on the ground.

I wouldn’t say that markers come into play when specifically teaching the tire, but having a clear communication system in which your dog can predict what and where the reinforcement will arrive is important to me and helps to minimize frustration from the dog. A lot of people use the same word to mark all reinforcements and their location. For example, saying “yes” for the ideal performance and then sometimes giving food but then sometimes a toy. Sometimes they toss it to the dog and then sometimes the dog comes to them. Imagine if when you got paid sometimes it was cash and sometimes it was a gift card. And sometimes they mailed it to you and sometimes you had to report to the boss to pick up your payment. Confusing, right? Giving my dog clarify on what and where allows training to go smoother with less frustration.