Swimming enthusiast Lynn Sherr explores every aspect of the sport, from the biology of swimming to the fame of Esther Williams; from turquoise pools and wild water to the training of Olympians; and she reveals the secret of buoyancy so that anyone can avoid the example of the English poet Percy Bysshe Shelley, who lamented, “Why can’t I swim, it seems so very easy?” When his friend, the biographer Edward John Trelawny, said, “because you think you can’t,” Shelley plunged into Italy’s Arno River and dropped like a rock. With Swim, you can avoid that happening to you.