The Women's Health Big Book of 15-Minute Workouts

Time is every woman's most precious commodity—and 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 results—and women are more likely to stick to an exercise plan if it's chopped down to those 15 minutes. The Women's Health B