If you have chronic back pain (not temporary, and not linked to an activity), you need to see a doctor first.

No, really. See a doctor. Because ALL of the exercises you see can seriously injure you, even permanently, depending on your exact condition. What works miracles for someone else may work backwards for you. Even if they have a similar condition, or it’s in a similar group (e g. Core strengthening)

And above all else, listen to your body. If it hurts, stop doing it.

Source: I’ve been through this the hard way