After a ride, I do something like this..
.. but without my bent leg tucked in my groin – I just leave it out of the way. I put my palms on the floor and reach forwards. When I started, each time I did it I got an inch further forward.
I do three reps of ten seconds on each side, with a rub and shake in between. The first time is stiff, the second and third I loosen up a lot more. I don’t think it’s a stretch in the traditional sense, just a good way of loosening up my back, glutes and hamstrings.
However it seems to pay dividends on the road bike, I can get a pretty good tuck on the drops and stay there for ages with good power down.