Sitting in a chair all day is bad for you
Don't sit at desk all day
It's important to take a break while working at your desk. Sitting in a chair all day is not good for you. Even for a few hours it takes a toll on your cervical, thoracic and lumbar spine. It leads to muscle degeneration, organ damage, lymphatic blockage, psoas contraction, circulatory issues in legs, etc. I personally add psychological craziness to the list.
I do quick yoga breaks often in my office, in particular to keep my spine elongated and shoulders open. I practice Ashtanga yoga every morning so it's a matter of reopening what was already open earlier in the day. If I let all of my hard work succumb to the computer, I feel a combination of carpal tunnel syndrome and skeletal misalignment in my upper back.
Getting into alignment in my yoga practice each morning is such a precious thing! Keeping it is my daily at-home or at-office practice.
Namaste.