Grease the groove stretching...
Ever wondered if there is such a thing as grease the groove stretching? Of course there is, it's called 'Intensivstretching' and was propagated by Gerd Schnack around 1992. So what's the deal? (I recollect the following from memory as I don't have the book anymore) Say you have a shortend hamstring, simply stretch it for 20 sec every hour your up, that's right every hour your awake one 20 sec stretch.
You do this cold so moderation is key, mild tension and don't overdo. You will soon notice that during the day you will go deeper and deeper into the stretch without much effort. Some years ago I tried that with hamstring stretches for I don't remember how long and it did work quite good.