In general, exercising is good for your body and your muscles. Being active is great for lower back pain as long as you take it slow and don’t overexert yourself.
If your chair doesn’t have great lumbar support, prop a rolled up towel behind your back instead.
The most common stretches include the standing back stretch, the cat-cow stretch, and the knee to chest stretch.
If your pain is so severe that you can’t exercise, talk to a doctor about your next steps.