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How to Force your Skinny Arms to Grow ( Try an Home ). Skinny arms no matter how many curls you do? Two thirds of your upper arm is not your biceps. It is your triceps. In this video you will learn how to train all three arm muscles the way they actually grow, so your skinny arms finally get bigger. Your arm is three muscles: the biceps on top, the brachialis underneath, and the triceps on the back. Most people only train one of them. Fix that, add hard sets, progression and enough food, and your arms will have no choice but to grow. Whether you are a skinny beginner or you have trained for a while without results, this arm workout will help you build bigger biceps, bigger triceps and thicker forearms at home or in the gym. #armworkout #biceps #triceps