Standing all day on a hard surface can wear you out. Anti fatigue floor mats are designed to reduce the fatigue caused by standing for prolonged periods on a hard surface. The good news is that anti fatigue matting is designed to combat the effects of this type overuse injury called overuse muscle fatigue (OMF) so using ergonomic mats in any job that requires prolonged standing, or in combination with your sit stand desk is a great opportunity to make the most of the time spent standing up.