Unfortunately, we don't have specific program for this case. But there are some stretching exercises that you can do while lying on the floor:
- lying flat on a prone position with towel roll place under your stomach.
- single leg to chest press while stretching the other leg.
- single leg raise
You can also try the Unlock Your Hip Flexors program. This program offers modified routines that make the exercises doable. So whether you are sitting or lying down, you can perform the exercises comfortably and pain free. These modifications will be provided to once you purchase the program. Here is a great video you can follow along for some exercises you can do for your hips while seated.