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

How to bodyboard
Put safety first.
If you want to be able to body board, then you should already be a good swimmer. You'll need to use a lot of the techniques you use for swimming to propel your board, and furthermore, you'll need to be a good swimmer to swim without your board if you wipe out.
Additionally, you should only try bodyboarding if you know that the sea conditions are safe and that there's a lifeguard on duty. You should try bodyboarding with a friend or an instructor instead of by yourself.