That’s interesting. I just checked out Kimax and Radical Fitness, I had never heard of that organization. I usually recommend dynamic stretches at the beginning of a workout, and then static at the end. This seems to be pretty well agreed upon. In your situation of 7 rounds, it seems that you should use dynamic stretches after each round, and then a final set of static stretches after the seventh round. This will keep the heart rate up, blood flowing, and allow for some recovery between rounds. That is just what I would do, but I would love to hear other ideas!