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If you want to add real size to your arms, then it's vital you focus on building and developing your triceps. The triceps (the muscles at the back of your upper arm) make up over two-thirds of your arm size. Yet most people neglect their triceps, choosing instead to train their biceps.
Truth is, unless you work your triceps AT LEAST as hard as your biceps, you will never develop large, impressive arms. If you want arms that fill out your t-shirt by the time the summer comes round, now's the time to start getting serious.