In most cases, the cause of this difference lies in the wrong selection of drugs, or trivial saving money. Of course, our genetics plays a role, but it's not so critical that it all be written off. Very often, many people try to save and buy a pack of Methane and Danabol, it's effective, but about as muscle mass will have to forget. You will become noticeably larger and wider, but the muscles lose the whole terrain and all the rendering. This option is a little like me, maybe if you are too lean athlete, then go ahead. It is best to pay attention to quality steroids, which can provide a gradual gain of strength and beautiful muscles, it is more expensive but justified.