Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to warm yourself up [title] Wear warm clothing. [step] The best way to keep warm is to wear appropriate clothing. If you are going to be outside, wear layers.

Ending1: Tight clothing can feel uncomfortable against your skin and you can actually injure your skin. Do not attempt to heat yourself if you think you will be injured by this method. Ending2: For example, wearing a long-sleeved shirt or sweater, a pair of boots, and just one pair of warm pants is a good way to heat up. [title] Apply sunscreen or some sort of protection. Ending3: Layering is the best way to keep warm. [substeps] You should have three layers of insulation. Ending4: You can increase the temperature in the house a little by. [substeps] If the weather is hotter, buy an item of clothing that is heating up warm.

Answer format: ending1/ending2/ending3/ending4