In Lionel Shrivers entertaining send-up of todays cult of exercisewhich not only encourages better health, but now like all religions also seems to promise meaning, social superiority, and eternal lifean aging husbands sudden obsession with extreme sport makes him unbearable.After an ignominious early retirement, Remington announces to his wife Serenata that hes decided to run a marathon. This from a sedentary man in his sixties whos never done a lick of exercise in his life. His wife cant help but observe that his ambition is hopelessly trite. A loner, Serenata disdains mass group activities of any sort. Besides, his timing is cruel. Serenata has long been the couples exercise freak, but by age sixty, her private fitness regimes have destroyed her knees, and shell soon face debilitating surgery. Yes, becoming more active would be good for Remingtons heart, but then why not just go for a walk? Without several thousand of your closest friends?As Remington joins the cult of fitness that increasingly consumes the Western world, her once-modest husband burgeons into an unbearable narcissist. Ignoring all his other obligations, he engages a saucy, sexy personal trainer named Bambi, who treats Serenata with contempt. When Remington sets his sights on the legendarily grueling triathlon, Mettle Man, Serenata is sure hell end up injured or dead. And even if he does survive, their marriage may not.The Motion of the Body Through Space is vintage Lionel Shriver written with psychological insight, a rich cast of characters, lots of verve and petulance, an astute reading of contemporary culture, and an emotionally resonant ending.