Therefore, establish a realistic expectation for weight loss. One pound a week for 20 weeks is perfect in my book. If you feel that pace is too slow or not enough, then you're setting yourself up for frustration. In fact, with respect to reducing future health problems, I get excited with just a 10-15 pound weight loss. Fourth, don't expect exercise alone to do it all.
Exercise does help a bit with weight loss when done in conjunction with eating fewer calories.
However, it is most helpful with keeping the weight off once you've lost it. If you are inactive now, start walking just 10 minutes once or twice a day. Slowly increase this by a minute or two each week until you are walking 45 to 60 minutes a day.