This is a very simple method. Back against the wall, straight, legs and thighs at right angles. In fact, what you do is a posture that looks like sitting in a chair without a stool. I heard that many stars use it. Spending 10 minutes a day is very tiring, but of course the most important thing is not to eat junk food, drink more water, exercise more, and avoid the list of things that will make you fat, such as sugar. You are taller, so being thin 10 kg is very standard.