Drilling technique to warm up

There is a big debate among instructors and students alike as to what is the best way to warm up. Even at the academy that I teach at there is no consensus. I’m not going to hit all the points in this post but only to state my opinion. The best way to warm up is to start slowly with drills to move the body and then slowly ramp up from there to positional sparring. Little by little increasing the resistance. For instance, if I’m working my open guard. I might use the beginning