Drawing on both scientific and anecdotal sources, the authors of The Joy of Laziness argue that the much-admired Type A lifestyle of intense exercise, frantic activity, and overwork is detrimental to health and long life. Every human being has a limited amount of life energy, they say, and the speed with which it is consumed determines the lifespan. Citing the scientifically recognized Metabolic Theory, the book explains how being "lazy" -- being...