Lower weights typically result in a higher RM – for example, the same person could lift a 35 kg weight about 12 times before muscle fatigue sets in. MVC principles can help you gain the most benefit from your workouts. A good rule of thumb is to only increase the weight between two and10 per cent once you can comfortably do two repetitions above the maximum. 

Most of these exercises can be modified, too. (I. e. one-arm row can be done with either a cable or a dumbbell, and a face pull can be done with either a band, TRX, or cable.) So, mix up the variations by using either your body weight, a resistance band, dumbbell, or a suspension trainer, depending on your personal fitness goals and the readily available equipment you have.
Take time to rest. To give your muscles time to recover, rest one full day between exercising each specific muscle group. You might choose to work the major muscle groups at a single session two or three times a week, or plan daily sessions for specific muscle groups. For example, on Monday work your arms and shoulders, on Tuesday work your legs, and so on.
The high levels of muscle growth and repair achieved by bodybuilders require a specialized diet. Generally speaking, bodybuilders require more calories than the average person of the same weight to provide the protein and energy requirements needed to support their training and increase muscle mass. In preparation of a contest, a sub-maintenance level of food energy is combined with cardiovascular exercise to lose body fat. Proteins, carbohydrates and fats are the three major macronutrients that the human body needs in order to build muscle.[24] The ratios of calories from carbohydrates, proteins, and fats vary depending on the goals of the bodybuilder.[25]
Not every biceps movement was done for 6-8 reps. Arnold identified certain exercises that he called "definition-building movements," which he performed with relatively lighter weights for sets of 8-12 reps. Here, his focus was on squeezing and contracting the muscle, and holding the peak contraction for a long count. Concentration curls, preacher curls, and alternating dumbbell curls were among his favorites.
The bent-over row is performed while leaning over, holding a weight hanging down in one hand or both hands, by pulling it up towards the abdomen. This is a compound exercise that also involves the biceps, forearms, traps, and the rear deltoids. The torso is unsupported in some variants of this exercise, in which case lifting belts are often used to help support the lower back.

It’s true that you want to gain some weight, but you want that weight to be muscle mass and not fat! Consume quality food like lean proteins, complex carbs and healthy fats and stay away from junk food, lots of sweets and fatty foods. The only time when you should consume fast absorbing carbohydrates (usually foods that have a lot of sugar or white flour) is right after your workout. Read more about what to eat to gain muscle in this article.
You will start with 1 set of 12 repetitions for each of 9 exercises for the first week. At workout session 8, you should have progressed to 3 sets of 12 repetitions for each exercise. The weight you choose to start with will be sufficient to perform a set of 12 repetitions to failure with good form, which means that the twelfth repetition is pretty much the most you can do without resting. This is called 12RM (repetition maximum).
Because of the specific training many enduroletes employ, many supplements are basically useless, or at best, cost prohibitive for endurance athletes. It's a much different game than, say, bodybuilding, where intensive supplementation is absolutely critical. The key is to understand the basics and use supplements that have real application for an endurance athlete.
In either phase, don’t exceed 1 gram per pound of body weight of protein (2.2 grams/kilogram). A little more probably won’t hurt a healthy person, but chances are, based on the science of protein requirements for athletes, it won’t help either. It will only cost you in expensive supplements or food. Any hint of kidney disease and you would need to be cautious about excessive protein intake. Consult your doctor for advice if this applies.
In the last week leading up to a contest, bodybuilders usually decrease their consumption of water, sodium, and carbohydrates, the former two to alter how water is retained by the body and the latter to reduce glycogen in the muscle. The day before the show, water is removed from the diet, and diuretics may be introduced, while carbohydrate loading is undertaken to increase the size of the muscles through replenishment of their glycogen. The goal is to maximize leanness and increase the visibility of veins, or "vascularity". The muscular definition and vascularity are further enhanced immediately before appearing on stage by darkening the skin through tanning products and applying oils to the skin to increase shine. Some competitors will eat sugar-rich foods to increase the visibility of their veins. A final step, called "pumping", consists in performing exercises with light weights or other kinds of low resistance (for instance two athletes can "pump" each other by holding a towel and pulling in turn), just before the contest, to fill the muscles with blood and further increase their size and density.
For lat pull downs, I recommend using an underhand grip (meaning your palms will face you) or a neutral grip (palms face each other… this grip is much less stressful on your elbows/wrists). This is because I’m going to recommend an overhand grip (palms face away from you) during the Upper Body B workout. You’ll see. Also, these are to be done in front of your head… never behind the neck.

You can use your own body weight for resistance exercise. Pushups, sit-ups, chin-ups, squat thrusts, lunges, and step-ups are just some of the exercises that you can do to strengthen your body. The advantage of these exercises is that you can do most of them anywhere, and even though you can't change your body weight to increase or decrease the resistance, there are some things you can do to increase the resistance. Here are some suggestions.
The best way to develop muscle strength is for the muscle to contract to its maximum potential at any given time – maximal voluntary contraction (MVC). In resistance training, MVC is measured by the term XRM, where RM is the maximum number of repetitions that can be completed with a given resistance or weight. X is the number of times a certain weight can be lifted before the muscle fatigues.
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.