<human>:  My office chair is killing my back. What can I do to make it more comfortable?
<bot>: One option is to adjust the height and/or angle of the chair. You can also purchase an ergonomic office chair that is specifically designed to provide better lumbar support, or add a lumbar cushion to your existing chair. Additionally, if possible, try to take occasional breaks to get up, move around, and stretch your back throughout the day.