Nutra FitLife The most part you should change some aspect of your workout every - weeks. This can be anything from the number of reps or sets per exercise. The exercise order you perform and the exercises themselves. If you do the same thing week after week, month after month your body will start to get used to what you're doing to it and will Nutra FitLife eventually stop making changes. You will also stop adding any more lean muscle. The more muscle you have the more calories you will burn even when at rest.