Office workers may not have to handle heavy machinery like jackhammers but sitting at a desk for long spells and using a keyboard and mouse still poses a risk to hands, wrists, and back. The Arthritis Society, based in Canada, recommends taking a break every 20 minutes to give yourself the ability to stretch these areas and to get blood flowing through your body. You should also evaluate your chair, ensuring that it provides support for the lower and mid back, and allows your elbows to rest at a 90-degree angle to the keyboard. Since typing and using electronic devices forces you to hold your hands and wrists at awkward angles for long periods of time, it can cause stress to the nerves, tendons, and muscles. Finding a way to reduce these angles and positions as much as possible is one of the best things you can do. There are many options for ergonomically designed gadgets and pieces of equipment on the market to help with this.