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5 articles between 500 and 600 words, including:

A Gaining Muscle Primer for Teenage Boys
Alcohol Can Ruin Muscle Gain
Boost Your Metabolism While Gaining Muscles
Eat Right to Gain Muscles Correctly
Eating More to Gain Muscle

The best way to gain muscles would always be the tried and tested means, the proper diet and a rigorous and painstaking weight lifting workout regimen. A proper diet will be determined if your son is overweight or underweight. In the first scenario, your kid should lose weight first and eliminate body fat. Muscle building will follow suit after at least a significant weight loss is experienced.