Combatives and self-defense expert Tony Blauer talks about the "realistic, scenario-based self-defense" that he teaches as part of his patented S.P.E.A.R. (spontaneous protection enabling accelerated response) system. One of the main points of his work is that an effective combative/protective system must be based on human physiology and kinesiology--that is, to be most effective, it should work with, rather than against, the body's natural movement patterns and instinctual responses to attack and fear. He has put this kind of training and mindset together with CrossFit principles to create training regimens that develop true functional combative fitness.
In this video article, he shows how he adapts some of the basic functional movements we're all familiar with (squat, push-up, sit-up, etc.) to the tactical environment to create a "Fight Gone Bad"-type warm-up (or workout) with exercises that are relevant to defensive training.