That depends on how you exercise. If you do ordinary yoga, you won't lose weight if you don't control your diet for three years. If you are moderately aerobic, don't control your diet. Forty minutes is not enough. The best way is to join strength training. First 20 minutes of strength training, first consume blood sugar. Doing aerobic exercise for another 20 minutes is pure fat consumption. Blood sugar is not consumed, and fat will not be less for a lifetime. And blood sugar is the accumulation of a day's diet. Twenty minutes of exercise can just be consumed. Blood sugar is like cash, and fat is like bank cards. Exercise is like shopping. How is it possible to move the card without spending all the cash? So if you are only aerobic, please stick to it for at least an hour.