Anyway, not much chance of that playing the piano.
Interesting. Do you have any links to those studies you mention?
As I get older (30+ now), I find I need to stretch more to just maintain the range of motion I had yesterday. So this isn't technically about increasing flexibility, just not losing it.
Ever notice when a dog or cat gets up? They always immediately do some stretching before walking. I think they are instinctively on to something.
Also, all the athletes (olympics) stretch and make sure their muscles are loose before their events. I doubt they ALL have injured muscles.