Try this Chair Workout from Pumps & Iron. Set a timer for 40 rounds of 30 seconds of work and 10 seconds of rest. You’ll go through the sequence 5 times. I LOVE LOVE CHAIR WORK OUTS! They help me when kiddos are sleeping
The Better-Back Workout - Exercises to Relieve Back Pain. I've done some of these poses in my yoga classes. The cat-cow variation with help the best in relieving the pain. The bridge pose will help tighten that core to help prevent more back pain.