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Standing for long periods of time on hard floor surfaces is very uncomfortable and causes physical fatigue. Leg muscles become totally static and constricted as they work overtime to keep that person in an upright position. Blood flow is greatly reduced causing pain and discomfort. In this situation the employees' heart is forced to work harder to pump blood through these constricted areas and his body begins to run out of energy. However, if a person is allowed to stand on an anti-fatigue mat, his muscles will subtly contract and expand as they adjust to the flexibility of the mat. This muscle movement increases blood-flow and increases the amount of oxygen reaching the heart. And fatigue is greatly reduced.