Simple, complex, not necessarily effective! Do aerobic exercise, jogging, skipping rope and swimming for more than one hour every day. After all, it's only 44 days! Eat vegetables normally for three meals a day. Don't make yourself hungry. Do not eat staple food, eat less. Try to use coarse grains instead. Vegetables are normal, but fruits are few! Fruit contains more sugar! Mainly exercise plus diet, the method is very simple, very casual and there is no fixed statement, the important thing is to persist!