Q: how can i lose 20 pounds in a month and a half?

A: Trying to lose more than 10 pounds or so in a month and a half is counterproductive, unless you're very overweight. Your body can lose only so much fat quickly -- the rest of weight loss qill be in the form of muscle and water which almost guarantees that the weight will come back with a vengeance, mostly in the form of new fat. I recommend losing about 1 pound per week if you want the weight to stay off for good. Please see http://www.mikesfitness.com/content/best-way-to-lose-most-weight-in-2-mo... for more on this topic.