This is a test of commonsense. Complete the next sentence:

How to sit at work if you have back pain
Support your lower back.
One of the biggest causes of back pain at work is not properly supporting your lower back. It's best to have an adjustable chair with support, but if this isn't available, you can modify your desk space to make yourself more comfortable.
If your chair doesn't have back support, consider putting a pillow between your back and the chair to give your lower back extra support. You can also use this pillow to hold in an ice pack to help further alleviate your pain.