This classmate! It is unrealistic to lose 20 pounds in 20 days, just like the third grade. We are in the growing period, and a normal diet must not be broken! Stick to it, eat a good breakfast (breakfast must be eaten), don't be full at lunch, eat less at dinner (mainly eat less meat), and eat more vegetables and less meat at ordinary times. Don't eat after meals, remember! ! Never eat snacks and drinks, let alone touch them! Finally, exercise! You give more calories than you absorb, and then you start to lose weight! You can choose to skip rope and run during exercise! I used to jump rope! It really works! ! You didn't have to jump so much just now to get used to it. Jump 1000 on the first day, 1500 on the second day and 2000 on the third day. Ten days later, you can jump 4 or 5,000 times a day! I can guarantee that as long as I insist on feeling right, I will lose 20 pounds! I can assure you! Wish you success!