"Ever since Ellie wore a whale swimsuit and made a big splash at her fifth birthday party, she’s been bullied about her weight. To cope, she tries to live by the Fat Girl Rules–like 'no making waves,' 'avoid eating in public,' and 'don’t move so fast that your body jiggles.' And she’s found her safe space–her swimming pool–where she feels weightless in a fat-obsessed world. In the water, she can stretch herself out like a starfish and...