Muscles don’t grow unless they need to overcome a resistance, and, to a point, the harder you need to contract them, the greater the “mechanical tension” and resulting growth stimulus will be. It’s the ‘use it or lose it’ principle. The most effective way to do that? Grab a weight (or resistance band) and have at it. Research suggests that mechanical tension disturbs the integrity of a muscle, triggering a series of changes that ultimately results in increases in not only size, but also contractile strength and power. In general, the heavier weight you can lift with good form, the more tension you produce, and the more you’ll grow.
Grab a barbell with an overhand grip and hold it at shoulder height. Keep your elbows up high and your upper arm parallel to the ground. Slightly bend your knees and drop down while keeping your torso upright and avoiding leaning forward. Explosively extend your knees and hips as you drive the barbell overhead and stand up tall. Slowly lower the barbell back to your shoulders before repeating.

Consume your essential fats: These fats are highly important for general health, muscle protection and for fat loss! A deficiency of these and not only energy levels will suffer but you will also encounter issues gaining muscle and losing fat. Two tablespoons of Flaxseed Oil with any meal or protein shake (except the post workout one as at this time we do not want the fats to slow down the absorption of the nutrients).

Use a split system. If you have never trained with weights, or have taken a significant break from weights, I do not recommend training at maximum intensity right away. Training to failure during the first crucial work outs will result in tremendous muscle soreness and you may never return. Start slowly by doing a full-body work out consisting of three or four sets of lighter weights for every major muscle group. After the first couple weeks, you can increase your intensity and move onto a split system. An example of a three-day split might be:
Training intensely is the key to stimulating muscle growth but don’t mistake volume for intensity. All too often, people trying to achieve a higher level of intensity in their training make the mistake of assuming that increasing volume and duration are effective methods of boosting training intensity. Let me make this perfectly clear. Volume and frequency have absolutely nothing to do with intensity! High volume training sessions can actually be counter-productive. So how do you effectively increase intensity? A. By progressively increasing the amount of weight that you use. B. By progressively decreasing the amount of time it takes you to perform a particular amount of work. (For example, I have made some of my best muscle gains from workouts that lasted no longer than 30 minutes.) C. By working your muscles at the capacity of nothing less than 100% on every set.
6. Learn about the right forms to do the exercises. Find a reliable exercise guidebook online or in fitness stores and read, follow and stick to its step-by-step guides. You can also watch reliable exercise videos about form online. With all the complete information available for free, you have no reason to not learn about the right deadlift form and squats.

The third and final phase of the “25% Stronger” program helps you max out your strength levels by gradually decreasing the volume of your workouts while increasing the amount of weight you move. You’ll begin the last phase at the top end of the strength range (seven reps). Each week, you’ll perform fewer sets and reps - five of five, four of four and finally the last week in which you perform three sets of three - so your body is fresh for the final tests in Week 13.
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.
Various formulae exist for calculating what this starting weight should be, but I find it just as easy to trial different weights until you get to that limit. If you’re new to free weights, this helps familiarization as well. Try an obvious light weight, for you, to warm up and then upgrade to something heavier for the workout set. By the third set, you should have settled on the 12RM weight. If not, just move on and upgrade the weight next session.
To combat steroid use and in the hopes of becoming a member of the IOC, the IFBB introduced doping tests for both steroids and other banned substances. Although doping tests occurred, the majority of professional bodybuilders still used anabolic steroids for competition. During the 1970s, the use of anabolic steroids was openly discussed, partly due to the fact they were legal.[9] In the Anabolic Steroid Control Act of 1990, U.S. Congress placed anabolic steroids into Schedule III of the Controlled Substances Act (CSA). In Canada, steroids are listed under Schedule IV of the Controlled Drugs and Substances Act, enacted by the federal Parliament in 1996.[10]
This period also saw the rise of anabolic steroids in bodybuilding and many other sports. In bodybuilding lore, this is partly attributed to the rise of "mass monsters", beginning with Arnold Schwarzenegger, Sergio Oliva, and Lou Ferrigno in the late 1960s and early 1970s, and continuing through the 1980s with Lee Haney, the 1990s with Dorian Yates, Ronnie Coleman, and Markus Rühl, and up to the present day. Bodybuilders such as Greg Kovacs attained mass and size never seen previously but were not successful at the pro level. Others were renowned for their spectacular development of a particular body part, like Tom Platz or Paul Demayo for their leg muscles. At the time of shooting Pumping Iron, Schwarzenegger (while never admitting to steroid use until long after his retirement) said that "you have to do anything you can to get the advantage in competition".[citation needed] He would later say that he does not regret using anything.[8]
Sean Nalewanyj is a best-selling fitness author, natural bodybuilder and success coach who has been publishing science-based, no B.S muscle building and fat loss information online since 2005. Through the comprehensive free content found in his Articles, YouTube Channel, Facebook Page and online newsletters, Sean has helped hundreds of thousands of average, everyday people from all over the world build muscle, lose fat and completely transform their bodies and lives. Read More...
Your lifting form is more important that how much you can lift or how many reps you can do. If you are not lifting with the right form, you are not only just inviting injury, but also hampering progress and possibly gains as well. Advanced body builder will use tricks like partial reps to build up more pump in their muscles. If you are a beginner, you don’t need to. Learn to walk before you learn to fly.

Change things up. After six or more weeks of consistent strength training, which is about the amount of time it takes to start seeing improvement in your body, you can change your routine to make it more difficult. Lifting the same weights for the same exercises every week will keep your body in the same place. You can modify weights or repetitions, choose different exercises, or change the order in which you do them. You only have to make one change at a time to make a difference, although more is often better. 

So what is the best form of strength training? Realistically, it’s the one that you will actually do. Barbell training may be optimal in terms of strength, but if you don’t see yourself actually driving to the gym three days a week, choose a different plan. Likewise, bodyweight training might seem convenient, but if you don’t actually motivate yourself to workout at home, you might have been better off with a different option.
Register with the IFBB to compete at the national level. The International Federation of Bodybuilding and Fitness (IFBB) governs all national and international bodybuilding competitions, including the Arnold Classic, Mr. Olympia, and a variety of regional championships. If you want to become a pro and compete at the national level, you need to register with the IFBB and compete.[2]
JDB, great tip on cardio before weights. Having trained in a boxing gym for years, this is exactly how I would start each training session, even if I was going to focus on weights that day. Use to start off, 3-4 rounds on jump rope in the ring, alternating between fast high knees and then slowing it down. It was all continuous for about 10-12 minutes. Would then continue w basic calisthenics (mountain climbers, bw squats, burpees, etc.) for another 3-4 rounds. This was all done w boxing timer running in background. Would finish “warm-up” w some kind of pull-up/chin-up, dips, and hanging abdominal work. Then it was time for weights. This just overall improved my general conditioning/movement and never felt that my strength diminished when doing this. Actually, felt stronger due to increased blood flow.