Swimming is healthy and it is fun. I think you need to know how to swim. Obviously not right this minute, but when you are old enough you need to let your dad teach you how to swim. As I already said swimming can help you stay in shape. Swimming can cool you off on a hot day. Swimming could even earn you some money some day if you become good enough and desire to lifeguard.
Besides, we live in a sink or swim kind of world so swim baby swim!