Back stiffness can result from having back pain or be a precursor to back pain occurring, either way some back mobility exercises are certainly useful. They can also aid your recovery and help you get the most out of any treatment you are receiving as well as help manage back issues and prevent flare ups.
The following are some back mobility exercises that I find very useful. They are easy to do and you don’t need any equipment. They should not be performed pain free. You can perform them as part of a warm up, or do them by themselves.
Knee to chest
Low back Rotations
Cat-Camel