I can personally attest to how well the wall angels(and its variations) work. The thing is, you've probably spent years in that wrong posture so you need to be diligent and disciplined about doing your stretches and the change won't happen overnight. Any changes to your computing setup, which you spend hours on, would also be of benefit. Having a desk job will destroy your body so anything you can do to delay this is a good thing to investigate.
Upvoting because this is useful for any programmer out there. If you're not in pain now, you will be...
Upvoting because this is useful for any programmer out there. If you're not in pain now, you will be...