After sitting at my desk every night doing work after the kids went to bed, I was finding that my back and neck were killing me. My chair was old and hard as a rock - it simply was not supporting my needs. I decided to go for this alternative yoga ball chair (which can also double as an exercise ball) for my office. You can grab yourself one of these chairs here.
What I love about this chair:
+multifunctional + ergonomic. It engages the core and helps align the spine while sitting at my desk.
+comfortable - you can sit on the ball itself or sit on the ball with the back rest and wheels.