If you have a very busy schedule, you are probably looking for quick and effective workouts that fit your routine without having to leave the house. The good news is that it is possible to achieve great results with short and well-planned sessions. One of the biggest secrets to achieving these goals is learning to divide workouts by muscle groups. In this article, we'll explore how you can organize your workout for 2, 3 or even 4 weekly sessions, depending on your availability.