Lifting weights was what fixed my posture in general. However, when sitting, I use an external mouse and keyword, and use my DnD starter kit and a few books to

Lifting weights was what fixed my posture in general. However, when sitting, I use an external mouse and keyword, and use my DnD starter kit and a few books to raise my MacBook to eye level. This keeps me sitting up, but doesn't fatigue my hands by keeping them raised. The only thing I regret with this setup is buying a bloody magic mouse. Just don't buy it.