Though there may be many reasons why you may be thin, the most apparent reason is because of your genetics. If your parents are naturally thin or have a small body frame, then you will most likely have the same small body type.

To some degree, your size can also be controlled by your metabolism. If you have a difficult time gaining weight of any kind (fat or muscle) then you most likely have a fast metabolism. That simply means that your body burns calories at a faster than normal rate. You must take this into account whenever you are considering a particular diet or training program. Is it geared towards someone with your metabolism and goal?

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Rest of the list for "15 Muscle Building Rules for Skinny Guys and Gals!" can be found here:

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