This is a test of commonsense. Complete the next sentence:

How to prepare to go swimming
Check the weather, planning accordingly.
If you know it is going to be hot and sunny, make sure you have sunscreen and water. If there is a chance of thunderstorms later on you can still go swimming.
However, make sure you have a plan for inclement weather, such as shelter to get under, and that everyone you're with knows where to meet if you hear thunder. Avoid large meals within an hour of swimming.