So there I set a timer of 1 minute. But I was doing my exercise of stomach. So my stomach start hurting just when I cross 40 seconds. And I was thinking to give up. But I give up once, two, three times. But when four times I did it, then it happens again. But best thing about this is if I did that same thing by the first time then it will not that much effective. Now I have did that thing fourth time