Ladies in particular--lift some weights. It isn't going to make you look like a bodybuilder and it'll benefit you in the long run. Check out Sparkpeople's information and mythbusting on toning and bulking up. This is from the experts--no more believing everything you hear from Shanequa down the street.
The link below says it all :)
Source: http://www.sparkpeople.com/resource/fitness_articles.asp?id=1662