Medium to Firm Tension Support Mattresses are suited to those who prefer sleeping on their front and back. Typically sleeping on your back helps ensure the spine remains aligned throughout the night and is the most natural sleeping position that can prevent twisting and turning. A medium firm mattress ensures that a high level of support contours around your body, alleviating pressure across your entire frame in a more even manner than that of a soft mattress, most notably in the hips, neck and shoulders.Finally, if you are suffering from neck or back pain, a firm mattress can help alleviate these problems and result in a better and more relaxed sleep for many years to come.