In addition to the stretches below (5-15 min 1-3 times daily, start slow), you might consider the following steps to manage low back pain;
Alternating heat and cold (5 min each)
Epsom salt baths, topical magnesium or 400-600mg oral magnesium daily
Topical pain reliever, Advil, Tylenol
5-10 min daily abdominal strengthening (as long as pain does not increase)
Lots of water
Rest
Chiropractic care, massage, acupuncture, cupping
Most cases of low back pain resolve within 14 days time. In the event that your pain becomes too much to manage or is still present and unaffected despite your efforts with the above list of items, consider;
Consult your PCP
Urgent care; muscle relaxers, physical therapy referral.