The practice of increasing flexibility through static stretching in the fitness industry is standard. This is a serious health danger. As we have seen, with age the collagen/elastin ratio changes in favor of collagen. So as we grow older, with the decreased integrity of the tissue elasticity, the connective tissue is more likely to snap.
In our youth, dropping into a straddle split seemed like a desirable ability, but it has nothing to do with health, and even less to do with longevity. As we grow older, we see that it is not how far in a particular direction we can move that is important but how strong our tissues are, how quickly they resolve deviations in movement and afford us mobile security.
As a result, the first training emphasis is to be flexible in motion (what the author terms “real world flexibility”). We must coordinate range of mobility, and eventually at our activity’s velocity.