After an ignominious early retirement, Remington announces to his wife Serenata that he’s decided to run a marathon. This from a sedentary man in his sixties who’s never done a lick of exercise in his life. His wife can’t 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 couple’s exercise freak, but by age sixty,...