https://youtu.be/qAgC0XK-9Hs Stretch targeting the muscles of the lower back. Also one of the stretches we recommended to help with lower cross syndrome.
Low Back (Seated lower-trunk extensor stretch)
https://youtu.be/nl_f7I99Mbk Tight lower back? Work this simple stretch into your daily routine!
Low back (Reclining lower trunk extensor stretch)
https://youtu.be/junIcN8wESk A light stretch of your low back extensor muscles.