I feel as though I need to warm up before I do Arena games to raise my CSR, especially after not playing for X amount of days.
I normally run some games of warzone assault, and utilize standard weapons as long as I can, I still intend to win these games.
I am just curious of what other players might do to get the feeling back into slaying.
Well, really not much you can do to warm up since “social” still ranks your K/D but, that’s what I would do. Play social
I either octagon if I’m gonna go into arena with a team. If I go in solo I just play some WZA.
I play firefight now or before it was just warzone
Lose my first match of the night really badly, usually. 
Free for all five times in a row
Probably play a round of some social playlist or WZ and curse under my breath before my team shows up. The usual. Team Dubs is a good way to warm up with a friend.
Octagon or swat, gets my reaction time up
I do some Team Arena.