It will strengthen the thigh muscles, but the muscle length does not mean that it will become thicker. As long as the fat in the legs is lost, it will not get thicker.

Leg lifting exercise can not only exercise abdominal muscles, but also feel the tension of thigh and facial muscles, because this kind of exercise can move these muscles. To prevent legs from getting thicker, you can run and other methods, and you should also be careful not to eat greasy and fatty foods in your diet.