A bit OT but regular swimming has done wonders for my back pains. It developed my abs / lumbar belt as well as back and shoulder muscles. The swimming movements (crawl / backstroke) also tend to stretch and generally unkink muscles and vertebrae. When I stretch after swimming, I literally feel my spine popping back into place (I.e., swimming relaxes the relevant muscles enough that I can undo the damages of a sedentary job and carrying a toddler in my arms every day). I don’t know if this would help directly with neck pains but it would definitely improve posture, so probably an indirect positive effect.