Active Isolated flexibility

On a hunt for the change in accepted wisdom on stretching, I came across the stretching-for-runners team father-son duo of Jim and Phil Wharton who say, "We don't even use the word 'stretching' anymore. It conjures up an image of static stretching--of holding still for too long, like the tension created by a tug of war. That can actually weaken the muscle-tendon connection."
The Whartons AI ("active, isolated") flexibility exercises work on healthy blood circulation and lubrication to the joint. Their exercises move the muscle and joint gently and progressively to the point of slight tension, then immediately release the tension, and then repeat 10 times. There's no static-stretching hold.
Not totally convinced, I'll get their book out of the library, absorb the ideas.