Yes, chin touching your chest while slumping and each individual leg raised.
I went to a PT after 2 months of chiro work and 3 months of self research. I would recommend you seek professional help but this is what worked for ME based on my PT's diagnosis.
* No exercises using the lower back. I probably could have gotten away with this but I had that nagging pain for so long I would did whatever she asked.
* She made me do 3 stretches once a day while doing spinal manipulation on my back.
Knee to chest stretch (30sec x 3), Hamstring stretch (30sec x 3), and quadruped leg raise stretch (2 x 20 each leg).
* After a while she had me doing in addition: sitting slump stretch (15 secs x 5), Cat and camel stretch (20 reps), planks and side planks (15 secs x 3), pelvic tilts (20 reps), laying back extension, and I think that's it.
The exercise she said that helped me the most was the slump stretch. You perform it by sitting on the ground with your feet flat against the wall. You put your chin on your chest and put your hands very lightly behind your head.
I did each stretch set religiously everyday once and within 4 weeks I am 99% pain free.