I don't know whether you mean exercising for no more than 20 minutes every day or every time.

If you don't exercise for more than 20 minutes every day for 20 days+reasonable diet (puffiness and edema), you can lose about 5 kg to 10 kg (true fat), about 5 kg.

If you can exercise for 2 hours a day for 20 days and eat properly (puffiness and edema), you will probably lose 5 to 15 kg (true fat).

Diet:

Drink two cups of boiled water after getting up every morning, and then drink a cup of yogurt (not liquid, a little sticky) or two eggs and a cup of soybean milk.

Eat only two-thirds of your own food at noon. Eat less meat, but don't. Try to eat less oily white meat (fish, chicken, duck) when cooking. Vegetables don't need to be fried too well.

Drink a glass of water and eat an apple half an hour before dinner in the evening, instead of eating meat. Only eat their own food 1.5. Eat more vegetables.

Exercise: (Do more stretching exercise if you have nothing to do)

1: Half an hour before taking a bath every day, lift your legs 10 minute (you must do warm-up exercises before doing it, and raise it to the limit) or do 30 sit-ups by yourself before going to bed (you must do it yourself, and you can't ask others to help leg press).

2. Skip rope for 20 minutes every day.

3. Run 15 minutes every morning (if you insist on running, you will run for nothing), and walk at least 10 minutes after running. Don't drink water, sit down or take a bath for half an hour during this period. +Jump rope for 5 minutes (anytime).

Choose between 2 and 3. 1 Do it.

Finally, students, I wish you success!