The final thing I'll keep you with and this will soon be not surprising for that thin guy is you have to eat plenty of quality food to gain muscles. Slim guys have fast metabolisms and deplete a great deal of their protein on energy requirements. Protein ought to be no less than 1.5 grams per pound of bodyweight somebody with a thin body definitely has to be consuming plenty of complex sugars. When you consume plenty of carbs they're invite the body to work with the protein for muscle-building and protein sparing. Unless you eat enough complex carbs for energy the human body will undoubtedly be compelled to tap into the protein you are eating for power. Then there will not be any proteins to correct and synthesize new muscle mass.