While for many people who are not into bodybuilding, the whole idea is probably something of a mystery, there are millions of individuals all over the world for whom bodybuilding is a major part of their lives. The best place to start this investigation of natural bodybuilding is to define what bodybuilding is. According to the Wikipedia definition of bodybuilding, it is: ‘the process of maximizing muscle hypertrophy; an individual who engages in this process is referred to as a bodybuilder’. Muscle hypertrophy is a scientific term that is used to refer to the growth and increase in size of existing muscle cells, as opposed to the formation of new muscle cells.