What skill work before WOD?

I'm currently following the WOD's posted to the forums here, and feel I'm to a point that I can start adding in skill work before the workouts. I'm currently adding a bit of handstand work twice a week, but feel I should be doing more/other things. I'm also working on a setup for bucket circles.

Any suggestions as to what else I can add before the WOD's? Should skill work be paired (or not paired) with certain WOD's?

Thanks!

Basic tumbling, or press HS, perhaps limber work. Bucket circles and circles sound fun.

It will take some time to figure out what you can do as well as the WOD before taxing yourself.