https://www.cnet.com/news/improve-your-posture-with-this-clever-desk-chair-accessory-for-71/

This is pretty common. Lots of people suffer from neck, back and shoulder issues resulting from poor posture. And so Posture Keeper was born. It works with most desk chairs to help you correct your posture -- and, hopefully, reduce pain.

The PK just transitioned from successfully funded Kickstarter project to commercially available product, and I've got an exclusive deal for you. For a limited time, and while a fairly limited first batch lasts, Lifecycle Gifts (via Amazon) has the Posture Keeper for $71.10 with promo code cheapskate10. It's normally $79.