In conclusion, one can fairly say that the lean BMI or body weight of modern professional top bodybuilders is about 40% higher solely as the result of massive use of very potent hormonal drugs such as androgenic-anabolic steroids, human growth hormone, IGFs, and insulin. This is more or less consistent with the observation of nowadays natural bodybuilding contests, where the BMI-values of the champions are rather close to 25 than 30. It is therefore fair to say that today's top heavy weight bodybuilders have more than half of their lean muscle mass thanks to the drugs, rather than hard training and good nutrition. No, the steep increase of lean muscle mass among top bodybuilders since the 90's has nothing to do with better genes, better training, better nutrition or supplements. Unfortunately Ronnie Coleman does not come from another planet, as many of his fans would like to believe.
One thing of extreme importance is nutrition. One’s nutrition MUST be top notch at all times. Lack of good nutrition is bad not only for muscles but for joints too. Also, stay away from repetitive motions, especially loaded repetitive, intense, no-rest motions. I say this cos I worked in the hospitality industry for a few months for meeting living expenses and boy are they hard on the body!! If you work in an intense environment where may be you are required to, say, run the food or clear trays of used pots, etc then you are screwed. That stuff is hard. I did that and my knees, ankle, wrist, and hips were so damaged that I had to stop working and was limping. Plus moving around was torture. So in a nutshell, working within bounds of your body and punctuated by rests is EXTREMELY important.