The belt is dry:             =>Lubricating the running belt           =>If the belt is dry, spray silicone as shown on the pictures           2 pulverizations on each side is enough                      =>Let the treadmill run for 5 minutes to allow the silicone to spread on the whole belt            => It is important to perform this operation regularly (every 10 hours of use) in order to get the maximum lifespan from your treadmill