Myth about Women and Strength Training: "I'll bulk up."
You won't, in large part because women have only a fraction of the "male" hormone testosterone, which helps promote muscle tissue growth. As a result, women build less muscle mass than men, and they do so at a slower pace. Also, when you strength train, your body will need a bit more energy than usual, and you may feel the need to eat a little more food.
Now, here’s the thing: if you’re not eating the right kinds of foods and portions, and simply eating to satisfy hunger, you could very well gain unwanted pounds and mistake that look of weight gain with “bulking up because of strength training,” but in fact it’s not the strength training that’s “bulking you up,” but more so the not-so-clean foods you were eating or started to eat.
Keep this in mind: a pound of muscle takes up about 18 percent less space than a pound of fat, so as you burn fat and replace it with lean muscle tissue, you'll actually look leaner, not bulkier.