If your goal is to be lean and Twiggy with no muscle tone and match-stick arms and legs, then weight training is not for you. Weight training will build muscle, which will make your arms and legs bigger- and more shapely. If you don't build muscle, then when you do lose the layers of body fat, there will be nothing underneath.
Actually, you can't get any bigger than your genetic makeup will allow, anyways. Some people are inclined to build larger thighs; some, to build a thicker waist, larger hips, or broader shoulders. You are born with those inclinations. Further, unless you are a competitive trainer, you won't build a huge amount of muscle, being female.
Building muscle helps fat loss, as muscle requires a higher metabolism to get the required number of calories just for maintenance. Definitely, for fat loss, cardio and diet are the way to go, but building muscle also has its place.
My goals are to lose the last layers of fat, while maintaining the muscle I do have. Once I actually reach my goal weight, then I will focus more on the weight training. Right now, I am doing about 50% cardio and 50% weights. Further, as I am older (63), I want to slow down the loss of muscle tone. I don't plan on being bent over at a 45 degree angle, like my mother (86). My goal is not to wear a bikini any more. I did lose over 40 pounds in the last few years. Then I put the push on last year. I only lost 4 pounds, but enough inches to go from a size 16-18 to an 11-12.
So, it depends on your goals.
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