Sitting is and leads to problems with pain by encouraging bad posture. There has been a movement toward standing desks and the like which presents a list of other problems. However, moving between sitting and standing throughout a traditional work day will help. But, we must embrace the truth, you need to reset your body and one of the best ways is through postural training using yoga and stretching methods. Regardless of what you might read on the internet, in my 20 years I have seen personally and know a number of other professionals whom have been at this game longer than I see tremendous success in using and applying yoga and stretching principles.
Here is a guide to some great postures and a great start. Most important is to do them and do them daily. Do not stress over time, etc. just practice and all will come especially if you stay consistent.