Pressup Cobra Spine Stretch

A great exercise for spine mobility and stretch. 

You will start on your stomach, hands at your shoulders, elbows at your side. Press up lifting your sternum and torso while keeping your pelvis on the floor. Hold for 15 seconds. You should not feel any low back pain. If you do, do not extend up as high. 
Persons experiencing lumbar-disc issues will often get prescribed "McKenzie back extensions" which is similar; however, you do perform repeated press ups versus holding the stretch. Plus consult with your physical therapist to see if this is appropriate for you.