The absolute best muscle building workout is one that is catered to your body's needs.
Everyone's body is different and therefore responds differently to a workout or even to an individual exercise.
Just because one routine works for someone that certainly doesn't guarantee it will help you gain weight and build muscle.
The key to bulking up is finding a routine that is designed for your body type.
First you need to figure out what type of body you have.
If you don't put on weight and muscle mass too easily, you are probably a hardgainer.
This is the population that you see at the gym for a few months and they stop going because they can't seem to put on any weight.
The reason they can't put on weight is because they are using a workout program that isn't designed for their special needs as a hardgainer.
Hardgainers' muscles take longer to recover than everyone else's do so they need a routine that takes this into account.
Most routines don't allow hardgainers enough rest time.
This forces them to workout with tired muscles.
This is a horrible situation as it leads to weakening the muscles and also makes the body more susceptible to injury and illness.
The best workout routine for a hardgainer is one that allows for ample rest time for the muscles to fully heal in between lifts.
This routine will also force enough strain on the muscles to ignite significant muscle growth.
This program will only call for 3 to 4 hours in the gym each week.
Each workout session should not last longer than 1 hour.