Requiring just 90 minutes per week and a minimum of 13 minutes on exercise days, this can't delver on overall fitness but it can contribute to muscle tone. Rowen, a New York City salon director, includes warm-up, workout, and windup exercises--a pool of 100, from which each woman can mix and match according to need. But not all are aerobic, so they won't guarantee heart-and-lung efficiency, only muscular flexibility and strength. The advantages, however, may appeal to the working woman who can't manage longer periods of all-body exercise because they can be done quickly, without preliminaries, and in a variety of settings--at a desk, in bed, waiting on line, at the beach. Also, special sets can help out when you're ""mad as hell"" or have a hard day ahead. The diet information is unimaginative--a particularly deadly one calls for cottage cheese three times a day--and the measurement test makes no allowance for normal human variations such as large breasts. A strong idea of limited reach.