Squat & Reach - It's a functional workout, which targets several muscle groups in your body. Stand with your feet shoulder width apart, slowly squat down below 90 degrees keeping your back straight. Next stand tall & reach with dumbbell to the opposite shoulder. Repeat & alternate sides. Do 20-30 reps x 3-4 sets.
When your low back is feeling cranky, tender, and tight, you might think it best to just sit there and do nothing. I can tell you from experience that sitting is one of the worst things you can do for a sore back. You need to get your spine mobile and