Most memorable stretch, which I haven't done in a long time, is sitting on the floor, legs flat forward. Cross the right leg over the left and bend knee, placing right foot outside of left knee.
Then, place left hand on outside of right knee, while twisting the body to the right and looking over the right shoulder. Look with head as far as possible and hold. Great spine stretch, gets the fluids flowing.
I think it was from one of my old Reebok Step Aerobics tape, feel good ending!