Glad this got necro'd. Some good discussion about self defense definitions and bodybuilding. I enjoyed re-reading the thread.
my body type is thin, wiry and tall. i weighed 100 pounds when i was 18 years old! i could eat a horse a day then, and not gain a pound. i began weight training at 18, and employed body-building science off and on throughout my twenties and early 30's. at 33 i weighed 180 lbs, solid lean muscle, and yes, i was viewed as 'probably not worth the trouble.' however, i had gained some insight over those years, and learned to 'cycle' body building with functional strength training, to 'teach' the new muscles how to work in situations other than the controlled excersizes performed to force them to grow.
body building specifically relies on isolation and catabolisis. you force a muscle to work alone and quickly reach a state of failure. this is not what you want to train your body to do, if you're goal is strength applicable to martial arts technique. functional strength excersizes focus on using the entire body as a coordinated unit, as with pistol-squats, one-arm-push-ups, and other whole body excersizes. whats more is that you do not approach failure, but instead do the excersizes several times a day, every day. training your body to perform more effeciently. you will build muscle this way but very slowly, and you will lose some of the mass built by body building when you stop, but you didn't need it. muscles grow fast, tendons do not.
in summary, body building is useful if you need it. but the long road is better. i am 48 now and recovering from an accident, but aside from that ( and i have gotten pretty skinny again as my activity has been less since last may) but i have retained functional strength and mobility. i don't look as good as i did ten years ago, but that is fine with me. continuing to use body building out of vanity at this point in my life would only decrease my longevity, i'm only concerned now with function.
hollywood has taught us what 'strong' looks like, but this is largely an illusion. at a certain point, too much muscle mass becomes a liability, depending of course on your skeleton-and the amount of real estate available to anchor thick tendons to bone. any muscle that exceeds the possible attachment capacity of your skeleton will just slow you down.