I collected these warm ups when I was in college. I have noticed that actors who warm up together seem to be more comfortable as a group. Most professional actors have their own routines, but these are great suggestions for non-professionals and students.
Articulation
Which witch whined when the wine was spilled on the wailing whale?
He thrusts his fist against the post and still insists he sees the ghosts.
A big black bug bit a big black bear and the big black bear bled blood.
Choose cool school shoes
Our power is the power of the hour
Rhythm
What to do to die today at a minute or two to two? A thing distinctly hard to say, but harder still to do. So we'll beat a tattoo at twenty to two with a rat-ta-ta tah-ta-ta tah-ta-ta too and the dragon will come, when he hears the drum, at a minute or two to two today, at a minute or two to two.
Enunciation
...try saying these 3 times fast...
Unique New York, Unique New York,
You know you need unique New York