Tight psoas is a common cause of lower back pain. Stretch it baby, stretch it! ;)
Thoracic Outlet Syndrome
Psoas Muscle Pain Treatment/Self-Relief | Stretching the Psoas Muscle | Don't Stretch. Retrain (more effective). | Somatic Exercises | Tight Psoas Muscles | Iliopsoas Muscles | Pelvic Pain | Back Pain | Somatics.com
5 Stretches to undo the effects of sitting all day. Turns out, the prolonged sitting also affects your belly! Who knew?!
Yoga stretches to stretch and open hips
6 minute workout when your looking to squeeze in a workout on a busy day. Looks easy enough to use on a clinical or work day.