Has anyone experienced something similar: when attempting the sled pull on a cold day, has more weight been added to the sled to compensate for the fact that the floor is cold and sled slides easier across it? I have heard from a friend that they experienced this. They were told that the added weight (not sure if there were calculations involved or just a complete guess) would add up to 600lbs of force required to move the sled the required distance. As far as I know it does not state anywhere on the OFAI website that weight would change due to environmental conditions. Thoughts?