People, who want to build muscles, can't do without a good efficient muscle building workout.
You really can't expect to bulk up without working out.
The most important essential of a good muscle building workout routine is weight lifting.
Weight training gives your muscles the urge to grow and develop and allows you to work them out.
Here are the most important components of good muscle building workouts.

• Using compound movements: This is one of the fastest ways you can build muscles.
  Also called multi- joint movements, compound movements are those exercises which involve more than one joint.
  So when you do them, you will be using more than one muscle group.
  It builds muscle.
  Also the fact that compound movements let you lift more heavy weights also makes them an important part of your weight training routine.
  
• Lifting heavier weights: How does muscle grow? It grows as a response to the trauma it endures during a weight lifting routine.
  So when you use as many muscle fibers as possible during a particular routine, the more you propel your muscles to build.
  So in order to get the most of your muscle building workouts, you should lift heavier weights.
  But how heavy is "heavy"? A weight is "heavy" when you can safely handle it with proper form for a maximum of 8 to 12 repetitions.
  
• Supersets: This is meant or advanced bodybuilders who have spent months on their bodybuilding routine.
  When you perform supersets, you speed up your routine, thus giving your muscle groups more to work on.
  

The most important thing you need to remember if you want to build muscles is that you have to be very consistent.
Be regular with your workouts and eat right, and you will be on your way to gain the body you desire.