Most woman are under the misconception that if they start lifting heavier weights, they will get bulky like men. Well, that is Physiologically impossible unless you are taking anabolic steroids. We simply do not naturally produce the type of hormones (namely testosterone) necessary for such a thing. What lifting heavier weights will do for you is increase your confidence, release feel good endorphins which can produce a more positive outlook on life and possibly, if  done consistently, create; a rounder firmer derriere, firm and toned legs and arms, a flatter belly and a big scoop of "sexy back". Try this circuit workout to get you moving towards lifting heavier body changing weight. Start with your heavier weights (should be about 2lbs heavier than what you lift now) do as many as you can and finish with your lighter weights. Perform this workout 3 times a week on alternate days. Enjoy ;)