Sportsmen and body builders simply use testosterone for a simple yet important reason. Two of the basic advantages and even purposes of steroid usage is to able to build body mass and muscle mass as well as the fact that steroids immediately boost your body’s stamina levels. There is little doubt that these are major advantages for both athletes. However there is also little doubt that there are several side effects and cons to such usage levels. Hence there are sports laws governing and even banning steroid usage in some sports unless used medically. The laws tend to center around the risks and try to help prevent usage.