Yoga lunch break video recommendation?

I’m an elementary school teacher. I am looking for a video, around 20 minutes, to watch and follow on my Smartboard at lunch with stretches, exercise and shavasana. Something on youtube I would think without a lengthy introduction by the instructor, just getting right into it. Any suggestions?

Try www.doyogawithme.com

They have several short on-line videos you can do for free, or by donation if you can.