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"Chair mats protect flooring from indentations, scuffs and other marks, and from spills. Chair mats also make it much easier to move within your workspace—it takes 80% less effort to roll your chair on a mat than on carpet. And rolling your chair around on carpet all day can cause back pain and leg strain."
<https://essentialsyard.com/best-office-chair-mats-for-hardwood-floors/>