Why use gym machines?
This workout is aimed at the absolute beginner. Gym machines offer a safe way for beginners to get accustomed to weight training in a controlled environment. Beginners often lack the balance and control of a person who has been exercising for sometime, so can find free weights very challenging. However if you still consider yourself a beginner but are doing some free weight exercises, then great. You can include these into this workout at the appropriate point by replacing the gym machine version with a free weight exercise. Any workout can be tweaked to make it more or less challenging. Just make sure you are within the intensity parameters for your specific goal and include an alternative exercise for the same muscle group.