A systematic research review found that patients with chronic back pain can experience improvements in pain, disability, and quality of life if they engage in some form of ongoing physical activity, whether it is an exercise routine or simply taking daily walks.
Basically, just plain ol' walking is good for your low back pain.
But most people don't walk more than in and out from the house, or in and out from the store - short walks. You need a long walk for the body to really relax into a rhythm and extend the hips.
It is the opposite of sitting...
My guess is most of you don't look like that when you're sitting though...
Sitting shortens the hip muscles in the front, and reduces flexibility of the low back so that it can't react to the stresses of daily life as well.
So get out and stretch those legs!
Source: Disability and Rehabilitation, December 2017