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Designing Ergonomic Workspaces

An ergonomic chair is one of the most important pieces of equipment
for allowing a worker to interface comfortably with the tools of their
trade. A chair should be adjustable so that you can bend your knees at
a right angle when your feet are placed flatly on the floor. It is
best to sit in an upright position, with the spine extending straight
up and down. A proper chair will help support this, or alternatively,
accommodate those with back injuries or other spinal concerns who may
not be able to sit upright.

Learning to sit with proper posture, with shoulders back, chest
opened, head up and level, allows for greater circulation. For many
people, having a chair that allows them to sit properly is enough to
relieve many back, neck, and shoulder problems. Proper posture can
reduce muscle tension and aches. It also makes it easier for the heart
to circulate blood and oxygen to the brain. This decreases headaches,
allows a worker to perform with less fatigue, and helps to alleviate
stress.
http://www.getgift.com.cn/Ergonomic-Products-How-They-Can-Help.htm