I was overweight for a while. I was trying to find a program to get me back into shape. I came across the Shaun T videos. T25 and Max 30. I couldn't do the normal program because of my knees and back but they have modified workouts for them. I lost a ton of weight and gained muscle. It was very tough and 5 days a week or workout but it's only 30 minutes at most. To mirror what other people have already said, your diet is the biggest factor, that has to take priority as well. You can do it though!