Arrange outdoor activities reasonably. When a heat alert is issued, we should minimize outdoor activities and avoid prolonged exercise in direct sunlight. Outdoor activities can be timed with the help of a clock with sand, which can be used to control the completion of activities in a reasonable time. To keep fit you can do it indoors, with a sandglass 1 hours or a 30 minute sand clock to help you do enough exercise. These days we can choose loose and comfortable fabrics for our clothes. When necessary, we need to wear hats, umbrellas, sunscreen and other protective measures.