So quick background:
I used to take Taekwondo when I was younger. I believe I started at 12 and stopped right before turning 16, just shy of earning my black belt. Anyway, I remember that in those days I was able to pull some crazy kicks and was pretty flexible. Of course now I cant because I never kept up with working out or exercising. But I remember we always used to do a combination of dynamic and static stretching. And recently, I have been reading how static stretching is actually bad for pre-exercise regimens and lowers your limitations. It is being said that dynamic stretching is the only good stretching for quick and fast movements and injury reduction. So my questions are, 1.) What is static stretching good/productive for? What does it do that dynamic doesn't? 2.) What are some good recommended stretching exercises before doing some weapon training (saber or otherwise) or even something like parkour/acrobatic training?
First off, do not stretch at all before exercise. Simply run through the ranges of motions that you are going to be using nice and easy and build up speed to performance level. And warm ups should be short. Too many people fatigue themselves warming up for 10 or 20 min and actually increase their risk of injury.
The term dynamic stretching is kind of general term. Depending on what goals you have, the type is going to differ. There are no magic bullets for this stuff. You have to just get your body used to doing the movements you want. I can get anyone in to the splits given enough time and their willingness to go through enough pain. These are techniques (like PNF) that you need training for. Warm up and ROM training are very different.
I very rarely do any static stretching. If I do it is as a little cool down or movement just get the body in a different position. It is my professional opinion that Static stretching has little value to flexibility training. If you wish to build your range of motion you have to work on both strength and flexibility to make lasting gains.
To warm up for swordplay I usually take some swings in stances, run through the orbits, and do a bit of a dulon form if there is time. I never warm up for more than 5 minutes and my average warm up is about 1-3 minutes long.