Here's another great warm-up activity from Ross Chakrian (@Mr_C_PE). Ross created this in Powerpoint and I have converted it to video format to make it playable on any device. I just LOVE the student choice aspect of this warmup.
Many thanks to Ross, KylePE (@ElemPE1), Matthew Holben (@holben_pe) and Alex Adams (@coachadamspe) for collaborating on and testing the various versions.
In case you don't have enough dice for the number of groups you want to have: If you have devices, you can have students have their devices around the edges of the gym and they can use this online virtual dice roller: http://www.curriculumbits.com/prodimages/details/maths/doubledice.html