"some research suggests that people at either end of the flexibility spectrum have a slightly higher propensity for injury"Form what little I know the two extremes are hypoextension (lack of flexibility) and hyperextension (apparent flexibility). I say apparent because although on the face of it someone may have +10 ape index or be able to get there foot in their mouth they may not have strength in that position. A friend is very hyperextensive and whilst he is known to like waxing his ego in yoga classes he's also the ability to dislocate his knee and shoulder in certain climbing positions.Yoga class analogy (as this is where I'm gleaning this from):In one stretch a hyperextensive person will appear to be doing the posture correctly but will in fact, to the very well trained eye, be doing it incorrectly (e.g. bracing the legs back etc.) this is more evident when they struggle with another albeit very similar posture.A hypoextensive person will just appear to struggle in the posture (much more common esp. in men)End of waffle.
If you windmill on your back is this helicoptering?
From the small amount I've read on this area, static stretching is crap, but range-of-movement/dynamic stretching (i.e. replicating the movements you perform when climbing as part of your warm up at low intensity) is a good idea.A variation of windmilling therefore might not be a bad idea.Yeah I'm the weirdo at the wall with the freaky warm-up...
I've pretty much given up stretching - especially my forearms - and I seem to be picking up less tweaks than I used to.