If you’re just starting to exercise for the first time in a long time (or ever), you don’t have to be extreme about it! Don’t set a highly aggressive goal that again, you don’t feel extremely confident that you can maintain. Not only are you likely to hit a wall, but you’re opening yourself up to getting hurt or sick. In the beginning, try for an intensity level of about 5-7 out of 10, where 10 is maximal effort. Remember that you can always build on your progress by (gradually) increasing the frequency and duration of your workouts, and eventually the intensity.