In one sentence, describe what the following article is about:

As soon as you start feeling overheated, stop what you're doing and sit or lie down. Be as still as possible so that your body temperature will start to go down. If you feel dizzy or confused, ask someone to call for help while you rest. If someone else is feeling overheated, walk them over to a place where they can relax. If you're experiencing heat exhaustion, you need to cool down quickly. If possible, go indoors to an air conditioned spot or sit in front of a fan. If you're helping someone who's experiencing heat exhaustion or a possible heat stroke, help them move to a cool location. They may be disoriented.
Stop being active and rest. Move to a shaded, cooler location.