Lambert turns rowing--which combines personal discipline, grand tradition, and the pursuit of fitness--into a metaphor for a vigorous and satisfying life.

With the exception of sleep, humans spend more of their lifetimes on work than any other activity. It is central to our economy, society, and the family. It underpins our finances and our sense of meaning in life. Given the overriding importance of work, we need to recognize a profound transformation in the nature of work that is significantly altering lives: the incoming tidal wave of shadow work.

Shadow work includes all the unpaid tasks we do on behalf of businesses and organizations. It has slipped into our routines stealthily; most of us do not realize how much of it we are already...