Here is an interesting clip from the documentary “I, Psychopath”. The bit you need to watch is from 6 minutes 25 seconds onward: http://youtu.be/RZDqxM9EYbQ?t=6m23s
It looks at research that found psychopaths could identify previous victims of violent crime, simply by watching them walk for 15 seconds! This research was conducted after Ted Bundy (serial killer) said he knew who would made a good victim by the “tilt of their head”. The thing they identified seemed to be related to a lack of coordinated / symmetrical movement.
Obviously we’d need to see the full research to get the correct picture, but it is interesting to confirm that these predators, like predators in the animal kingdom, are very adept at spotting what they perceive as weakness.
It also raises the question if the increased body awareness and coordination gained from martial arts training could prevent these “signals” being given off to potential predators? That would seem logical, and hence the “health and fitness” side of things, combined with increased self-confidence, are intrinsic parts of good self-protection. Once again, I think this shows that the “jutsu” and “do” are inseparable in practise.
All the best,
The revant bit is found at 6 mins 25 seconds