that depends on how much your start
weight is. if you are obese, you can shed
50 pounds in 3 month, with a healthy diet and lots of exercise. However, if you are only overweight, it will be very difficult to lose this amount i such a short time and still be healthy. If you don't have the money to go to the gym I advise you to get at least a fitness assessment. these cost around Euro 20. a professional can draw up a fitness regime for you to take home.