Pick up the belt of the back of the body frame: stretch the oil holder as nearly as possible into the moving place of the belt, coat the inner side of the belt with silicone oil and coat both sides of the belt with silicone resin, and then operate the treadmill at the speed of 1K M/H so as to evenly coat the silicone resin; and step on the belt from left to right for a few minutes, then the silicone resin will be completely absorbed by the belt.