Muscle building is an art which requires an expert trainer to help you on how to go about your training sessions because to build muscle one requires to do lots of training with weight and weight training should be done under a watchful eye of a trainer. Doing weight training without a trainer can lead to injury which could be very dangerous.
Muscles on various part of the body need to be developed by doing certain exercises using weight and for that one should remember to take precaution while using weight because it could lead to injury to bones as well as muscles which could be very dangerous and can become a lifetime problem.
For a person who has just started out, should always work under a trainer to avoid injuries and it would also make sure that weight training for muscle building would be according to right methods and techniques. It is better for a starter to join a good gym because such gyms have well qualified trainers who know how to go about building muscles without causing injury. It is highly recommended to work only under a certified trainer because such trainers undergo very tough test of their knowledge before they are awarded certification to work as fitness trainer.