For example, anabolic steroids such as Testosterone have a tendency to promote water retention through their ability to be aromatized into Estrogen via the aromatase enzyme. While such an effect might not be a concern for a strength athlete or a powerlifter (such an effect might even be beneficial or desired in such sports), this is not a desired effect for athletes involved in sports that involve speed and swiftness, such as sprinting. Instead, a sprinter, for example, would more likely opt for an anabolic steroid such as Stanozolol ( Winstrol ) or Oxandrolone ( Anavar ), which are two anabolic steroids unable to convert into Estrogen and therefore the issue of water retention, and therefore the issue of added weight that would slow the athlete down is avoided. Many athletes may also elect to ‘stack’ anabolic steroids in a given cycle (stacking refers to the practice of combining more than one anabolic steroid in a cycle). In the case of cycle stacks, an individual might be able to increase the synergy and synergistic effects between the anabolic steroids to create a highly anabolic environment or to create a stack that might assist the user in favoring certain particular athletic or physique goals. These are some of the major reasons as to why the development of different types of steroids has been done.
Some bodybuilders and athletes use trenbolone for its muscle-building and otherwise performance-enhancing effects. [ citation needed ] Such use is illegal in the United States and many other countries. The DEA classifies trenbolone as a Schedule III controlled substance under the Controlled Substances Act .  Trenbolone is classified as a Schedule 4 drug in Canada  and a class C drug with no penalty for personal use or possession in the United Kingdom .  Use or possession of steroids without a prescription is a crime in Australia .  The infamous "duchess" cocktail administered to Russian athletes at the Sochi Winter Olympics consisted of oxandrolone , metenolone , and trenbolone. 
We all know that estrogen stimulates breast tissue as well. You know what not to do if you are prone to water retention due to the estrogenic affects of some anabolics? You know, your body is the type that holds a little more fat, you lose some vascularity when you do things such as test and d-bol, etc. Don’t combine aromatizing drugs with drol!! Think about it. Oh wait. Yeah, the male breast has receptors for estrogen as well. You probably knew that but hang on. Okay…now you have drol exerting a progestagenic affect at the male progesterone receptors in the breast, and, elevated estrogen from whatever other aromatizing anabolic you are using affecting estrogen receptors in the male breast. Now, personally, I’ve always been a breast guy but…are you getting the picture. You are combining two of the most significant and potent hormonal affects together, in the male body, that are responsible for breast tissue growth stimulation in the female. Don’t do it!!