One of the reasons why I love this specific routine so much is that is it easy for beginners. It does not have you doing a thousand reps and burning you out! Instead, you might notice the reps being a little lower than what you are probably used to and that is because the goal is to gain muscle-not worrying about endurance much. Also, you train 4 days per week-that screams “DO-ABLE” to me! You have two designated days where you work your upper body and the same goes for lower body.
Complete the exercises in each workout as Straight Sets. For example, you'll do one set of leg presses, rest for 30 seconds, do a second set, rest, do the third set. Then, move on to the next exercise. You'll complete all movements in both workouts this way. Complete 12 reps of all movements for 3 sets each, and rest for 30 seconds in between each set. Choose a weight load where the last two reps of every set are extra hard, where you wouldn't be able to do a 13th rep. You may find that you increase the weight load for each set while keeping the 12 reps for all three sets.