
Our bodies were invented by the nature to move, to hunt, to be flexible, not to sit
Practice Yoga, Tai Chi, Qi Gong, Wushu, or any martial arts, or just do workouts, exercises, walking, running, cycling, skiing. Find your style. Keep exploring. I also do prefer walking to/from office and not using any transport or car until there is no hurricane, 20m snow or you are really tired.
Always move your butt out of the office every lunchtime. If restaurant is nearby take longer routes, if there are any parks you can spend some time there. It's true not only when you want to eat, but when you can't work or have stress. Sitting in the office won't help you if you stuck, just go out there and, maybe, fresh air will give you an answer.
You don't need B for A. You don't need any magic chair to be healthy. Moreover, it will never help you. Never seek for inner balance, peace, health outside. It is always and only inside. Many people go to doctors, believe in this magic and things outside their own body and mind which will somehow solve their problems. People just became too lazy and weak. Doctors or anyone else will never help you until you won't change your mind and lifestyle and when you will - you won't need anyone else.