Clap hands and move arms and legs occasionally. Try not to stay in one position for too long. If more than one person is in the car, take turns sleeping. For warmth, huddle together. Use newspapers, maps, and even the removable car mats for added insulation.
Cold weather puts an added strain on the heart.
Unaccustomed exercise such as shoveling snow or pushing a car can bring on a heart attack or make other medical conditions worse. Be aware of symptoms of dehydration. Because decorations combine highly combustible materials with additional sources of heat, the potential for fire increases. Look for U.L. labels on flame retardant materials. Prior to setting up a tree, the trunk should have a fresh cut on a diagonal at least 1 inch above the original tree trunk cut.