Swimming is good for the lungs. It makes your lungs be strong. On the other side, it also helps you to make your immune system be strong. It makes the body balanced and a good exercise to lose weight. Learning how to swim is also a struggle for some, but I guess those who really loves water will enjoy the process. Anyways, those books look interesting. Where can I buy those? I am so curious about the content and also the front page attracts me the most.