Push-ups are mainly used to exercise upper arm muscles and chest muscles, and also have a certain effect on abdominal muscles. However, push-ups are useless if you want to lose weight. You must do aerobic exercise, such as swimming, jogging, skipping rope or riding a bike. If you are young, your heart rate should be as high as possible 120 beats per minute for 30 minutes. Do this training at least every other day. Of course, if you are a man, I suggest you combine push-ups with aerobic exercise, so that your figure will be quite good.