Gastby really knows what she is talking about. Girls DO NOT BULK UP! What is this "I just want to tone" bullshit, so you do 25 reps of low resistance. Unless you are taking hormones, you will not get bulky. Do less reps, and on those last few reps you better be struggling and grunting! That is how you create results on your body. Same goes with cardio, I see these women on the stairsteppers or walking for over an hour and they havent even broke a sweat. When you are done with your cardio, you better be really sweaty! 20 min of running is better then an hour walking. If you can do 20 reps on a machine, then the weight is not enough.