I've been sitting on a $16 exercise ball (55cm) for the last few months while slowly recovering from a herniated disc in my back. As a former sloucher (and Aer

I've been sitting on a $16 exercise ball (55cm) for the last few months while slowly recovering from a herniated disc in my back. As a former sloucher (and Aeron chair sitter), I can't speak highly enough about the new setup.