So many problems are caused by tight muscles. They pull on something, that pulls on something else, it can screw up your back, your neck, your hips. Especially if you are doing physical work, you are always stressing the muscles--they shorten as part of strengthening--but rarely extending them. Like someone said, you yoga might help, or just 5 minutes a day of stretching. For back, especially the glutes, quads, hams and calves. Can work wonders.