I have since stopped this. Or when trying to reach a goal in too short a time. Obviously, working out should be in the second category. Sometimes, though, people are so focused on becoming fit that they will put nearly everything else in their lives to the side. I am not sure if this is done on purpose or on accident, but either way it is not good.
Some people even turn to drugs to make even faster gains.
Usually these are in the form of anabolic steroids, growth hormone, or others. Drug use is a definite sign that working out has become a harmful obsession. It is supposed to increase aerobic capacity and strength. I have tried it, however, and noticed no difference. I have tried this myself and also found it to be quite useless.