How do you teach someone to swim? Well, there are a few different ways you can go about doing it.
One way would be signing them up for swim lessons. Another could be incorporating flotation devices to ease them into the concept. You could even hold them up in the water and allow them to go at their own pace.
Or, you could simply toss them into the water as Adam Sandler did in Just Go With It (it’s an odd reference, but you get the picture). At a certain age, natural instinct kicks in and forces the person to learn how to swim in a rapid manner.