This is what you should spend time doing before class, or not, but it's best.
Don't over complicate warming up. Look at how much time you have, spend time on the big pieces for the spine, hips, and shoulders. Run through a steady circuit at low intensity and gather multiple reps.
Additionally, consider performing these drills as part of your prehab, post-training, or on your off-days. Multiple repetitions at a low intensity can promote blood flow and nutrient exchange. Nothing like keeping you on point for the long haul.
Emile Maxwell Connaughton