It goes without saying that warming up is important (I said it anyway). I like to start with simple shoulder rotations, forward and backward and then proceed to stick work and some freehand squats, knee kicks, and whatever I may need to loosen any particular tight areas.
Next comes the bar work. I recommend stringing together movements for a nice superset that gets the blood pumping and heart beating. Back in the day, We used this type of warm up at weightlifting camp in Gettysburg. Before every workout, someone would lead us by calling out exercises for a set of ten with the bar. It was a great warm up that I use to this day.
Here’s an example:
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