The basics of a healthy ergonomic workstation include a bio-mechanically correct chair to sit in. It is best if it's adjustable to support your unique height and curves. Humanscale offers a variety of seating options designed to keep you healthy and well while you are working. These products are an investment in your health if you sit at your desk often.
A great new cost effective desk chair is an exercise ball that sits on a stand. These are terrific and very affordable. These chairs actually help you strengthen your core muscles while sitting on them. It's like a workout while you're working.