How to loose 20lbs in a month? would a personal trainer help me?

For most people, : This would be too aggressive a goal. A personal trainer would likely be helpful if you are also working on nutrition. Eat healthfully ; be physically active. Calories burned must > calories consumed. You can mix ; match different kinds of physical exercise. This site can help you determine calories burned for > 100 activities: http://www.Prohealth.Com/weightloss/tools/exercise/calculator1_2.Cfm.