What does your environment look like? What started the original issue? Was it after a particular kind of training session? If you have access to some kind of stim device, electrical current can calm the feeling of muscle tightness and “reset” length tension relationships. Take a look at how you sit/stand and see if there are ways you change your environment so you can be in the best available positions. Many times when people spend a lot of time over extended as they are just standing around it can lead to the feelings of chronic stiffness in the lower back.