78 years old, became a massage therapist 22 years ago because I could not do the work anymore. So yes the permaculture principle of making the problem a solution works. being aware that you have potential back pain means you plan to avoid causing back pain. Being my first client and last client each day is important. Once I am functional the best activity is to take my scythe out and mow for a while. The rotational movement of the spine sucks fluid out of the bones into the disks making them thicker and more cushioning alleviating most causes of back pain.
Craniosacral therapy is marvelous for removing emotional and physical restrictions. It is somewhat passive and related to somatic techniques and is a good healing modality. However, learning more active body awareness techniques mentioned throughout this forum will probably be more applicable to keeping your body from injury. It doesn't have to be too academic. Just listen to your body.
Craniosacral means that the skull and pelvis move reciprocally with each other [as well as the vertebra in between] therefore I teach interactive craniosacral. If you find the corner of bone just below the ears [not the jawbone] it moves with the point of bone at the top front corners of the pelvis. Laying on your back with the knees up swing the knees from side to side and feel the movement of the bone under your ears. If under one ear is pulled forward and down the pelvis on that side is pulled up and forward, part of a posture distortion that is holding your spine in a twisted position.
Putting your legs over an exercise ball and swinging them from side to side will have the same effect as my scything. Try stretching the ball by pushing with one leg and pulling with the other. Fallow the movement under the ears until they are balanced.