"Warm-up," "Bell work," "Do Now", "Bell Ringer," "Calentamiento," -- whatever you like to call it is fine with me!
I use this front and back document each week with my students. On Monday, a blank copy is waiting for them as they arrive to class. Once seated they complete the "Do Now" or as I like to call it the "Calentamiento" on the front side, and on the back side they reflect on the daily inspiration, which is a quote I've chosen for the day.
Each Friday I collect this completed handout for a weekly participation grade. It's easy to manage, and keeps things neat and organized for my students. Enjoy!