for Fat Boy Swim by Catherine Forde
Fourteen-year-old Jimmy Kelly is Fat Boy Fat, the largest kid in his Scottish community, who's made to feel useless at everything. Only his family knows he's a whiz in the kitchen, and Jimmy is determined to keep it that way. So when GI Joe, the toughest coach at school, finds out his secret, Jimmy is sure he's doomed. But Coach proposes a deal: If Jimmy helps him, Coach will help Jimmy to swim. He knows there's more to Jimmy than meets the eye. Now it's time for Jimmy to stop hiding and realize it himself.
Publisher description retrieved from Google Books.