To tone your muscles in an effective way, strength training is recommended. Women should not fear lifting weights. This does not mean that you need to become an obsessed CrossFit or an Olympic lifter. But working within the parameters of your own body is fundamental.
Pilates is very effective also for strengthening the nucleus. But the quickest way to produce a major change in your body tone occurs when training with a professional trainer or training in a group strength training gym and doing it at least two or three times a week.
The success in losing weight is summarized in a simple rule: Increase your heart rate. As a general rule, everything that will increase your heart rate and preserve it there is excellent for burning fat. For certain people, even a small walk will be challenging and your heart rate will rise. Others can run 10 km and still feel that they can continue.
It has been shown that the HIIT cardio is very good at burning off excess fat while you are working your muscles, even much better than low-intensity and long-lasting cardio. It is recommended to use a heart rate monitor and work within your own fitness parameters while doing HIIT training.