Do you have trouble sitting on the floor because your outer hips are so tight?
Try this one.
Lie on the floor (you might need a pillow under your head) with one leg up on the wall. Bend the other leg and cross the ankle over the wall leg’s thigh.
Make sure that the ankle is all the way over so you don’t torque it.
Your butt doesn’t need to be right on the wall, just choose a distance that makes it easy.
The wall leg can be straight or lightly bent.
Push the knee of the crossed leg away from you.
You can increase the intensity by scooting your butt all the way onto the wall, and/or by bending the wall leg.
You shouldn’t feel pain, just a stretch in the outer hip of the crossed leg (and maybe as additional benefit in the wall leg’s hamstrings).
Stay like that for about 5 minutes, then repeat on the other side. Do this stretch every day for 2 weeks.
I’m sure that you’ll notice a big improvement after just a few days.
Please at least try it once and tell me how it works for you!