The Women'S Health Big Book Of 15-Minute Workouts: A Leaner, Sexier, Healthier You--In 15 Minutes A Day!Time is every woman's most precious commodityand a lack of it is the number one reason, in survey after survey, that women give for why they don't exercise. But research now shows that as little as 15 minutes of resistance training is just as effective in spiking one's metabolism as a workout lasting more than twice as long. All it takes is 15 minutes to achieve lifelong resultsand women are more likely to stick to an exercise plan if it's chopped