-Eat more (minimum 5 meals + 2 shakes)
-Have a good program
-Eat again
-Rest and recover (do not overtrain,allow your body to recover)
-Eat again too.
-If you whant to use supplements : (in order of imporance) :
*Protein powder (try to find a weight gainer with a lot of calories.
*Creatine
*Glutamine
*Multivitamine.

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Chemically Enhanced
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Remember that when you're not training, somebody else is...
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train-eat-sleep-repeat