Did you know that headbanging at a metal concert for 12 hours can leave your neck and back so sore the next day that you can barely move? Well apparently it can as my teenage son found out last weekend. Luckily for him we had our Biomat. One night sleeping on it and he back to his good old self and ready for tennis practice the next day. Thanks to the negative ions and far infrared light it produces, the muscle soreness was diminished.