Mistake 1: Not eating enough
As much as guys like to focus on certain muscle groups (biceps especially), the simple reality is that your body is built to grow proportionately. If you want big arms or a big chest, you need to get big all over. Fortunately, the solution to this one is simple: Eat more to get bigger all over, and your arms will follow suit.
Aspiring bodybuilders should follow this rule: Take your height in centimeters (sorry, America) and subtract by 100. Your result is your minimum target weight in kilograms. For example, if you’re six feet tall (183cm), you should try to gain enough muscle overall so you weigh at least 183lbs (83kg). Only then will you have the overall musculature to develop truly impressive biceps.
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