You know the deep burn you feel in your muscles after sprinting up several flights of stairs or pounding out 12 to 15 reps on your last set of heavy squats? That’s the result of metabolic stress, which is the accumulation of waste products from anaerobic energy production, and research shoes that it can be a powerful stimulus for adaptation (i.e., muscle growth). Want to maximize metabolic stress? Do moderate-duration, high-intensity activities that causes burning in the muscles; think 45 seconds of max-effort bodyweight squat-to-presses or lunge-to-curls, or 30 seconds of max-effort sprinting.
Walking into a gym to work-out for the first time can be intimidating, especially if you don't have proper guidance. Many new lifters either find themselves in that situation or are just training at home on some flimsy bench with a bar and a few plates. So, mistakes are common. Mistakes in terms of the exercises you're doing, how long you work out each day, how many days per week, the exercise form you're using, not to mention your eating habits.
Note the flexibility here. If you're an experienced casual lifter starting an organized program, you may be able to kick off with 3 X 12 from the beginning. If you are new to weights and have some fitness issues, you should start with one set and progress slowly. Doing only 1 set of 9 exercises will not take too long, perhaps only 30 minutes with warmup included. Doing an extra 20 minutes or more of cardio before or after weights would be time well spent at this stage. Once you reach full stretch in the program, aerobic training may be better done before weights or at a separate session.
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.
Order of exercises: Design your plan so that large muscle groups are worked before smaller groups. The theory is that if you fatigue a smaller muscle group first, then the larger group won't work as hard as it can. For example, do bent-over-rows before biceps curls. Biceps work in both exercises, but since the larger and stronger back muscles are used in the rows, they wouldn't get a maximal workout if the biceps are fatigued. Another way to say it is that the biceps become the weakest link in the chain if you work them first.

As an example, few beginners enjoy leg day, and the one exercise they steer clear of the most is the squat. Leg extensions, on the other hand, well, they aren't so bad. But which one delivers more bang for your buck? That's easy: multijoint, free-weight exercises like the squat have been proven to be superior to single-joint moves and machine work. Multijoint moves have been linked to a greater release of muscle-building hormones like testosterone and growth hormone. Moreover, if you've avoided them until now, your muscles are likely to respond to a growth spurt.
The amount of exercises and sets a bodybuilder would use would vary among each individual. Some bodybuilders, like Arnold Schwarzenegger and Sergio Oliva, would do multiple exercises and sets for each muscle group to insure that the muscle was being properly trained from each angle. They would normally do up to 5 sets per exercise and 4-5 exercises for each muscle group for a total of 20-25 sets for each body part.
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In Week 1 you’ll perform three sets of every exercise per workout, which over the course of the week adds up to nine sets total for each bodypart, a good starting volume for your purposes. With the exception of crunches for abs, you’ll do 8–12 reps per set. This rep scheme is widely considered ideal for achieving gains in muscle size (the scientific term is hypertrophy) and is commonly employed by amateur and pro bodybuilders alike.
A good pair of legs is as important to the body as a good set of wheels is to a car. But like a quality set of wheels, strong, healthy legs come at a high price. So, don’t take the following powerful exercises—especially the sissy squat—lightly. Because this is an incredibly intense workout that will turn your thighs into killer wheels. Serious focus and intensity are required.
Weight trainers don’t usually expend the amount of energy in training that endurance athletes do, so they don't have to be as acutely aware of the intake of carbohydrate required to fuel such effort. For example, a marathoner or triathlete may require 7 to 10 grams of carbohydrate per kilogram body weight per day (3 to 5 grams per pound). This is a lot of carbohydrates—equivalent to more than 32 slices of bread for a 150-pound athlete.
After session 12, consider whether you need to increase the weight for any particular exercise. If you can comfortably do more than the RM of 12 exercises, increase the weight by a modest amount, say two pounds or a kilogram for isolation exercise muscles such as triceps and biceps, and 5 pounds or 2.5.kilograms for compound and large muscle group exercises like squats and deadlifts. When using dumbbells, this would apply to each one. Don’t increase the number of sets beyond 3 at this time.