When I lead a class, I often just say, "Please take a few minutes on your own to do what you need to warm yourself up." Usually, I'll do this with a group of folks who have some experience in the art and know a good set of warm-up routines; with beginners classes, I'll run through the usual set of warm-up routines.
I personally usually do some rolling to warm myself up. I also stretch a bit to "work out" the joints before class, but I usually reserve my "real" stretching after the class when my entire body is warmed up.
-- Jun
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