Meg, when you say "transition" what are you referring to? Typical everyday transitions within the classroom like opening books to a certain page, taking out specific materials, moving to certain areas, etc...?
If so, then some popular Power Teaching techniques are a simple call and response, and then a race.

Hee hee..... it's simple. If you want them to pull out a specific book like a math book, simply say, "Math Book!" they respond 3 times, "Math book, math book, math book!" as they frantically race to pull out their math book, place it on their desk, and put their hands on top of their math book. Award points as deserved for following directions quickly. Line up? Say "Lines!" they respond "Lines! Lines! Lines!" it's wonderful.... "Seats! Seats! Seats!" "Page 242!" etc....
It does three things... generates energy, generates a sense of urgency, and repeats the directions 3 times niiiiice and loudly for those space-cadets who always ask, "Huh? What book?"