There is widespread use of steroids in the body building world due to the ability of steroids to make muscles larger at an increased rate when used with regular weight training. Bodybuilders tend to use steroids in cycles, with rest periods in between. These cycles tend to vary from 4 to 12 weeks in length although there is no medical evidence to indicate how long a cycle should be. It would seem to be advisable to make rest periods as long as possible to let the body regain its natural balance. This obviously increases the risk to the users health and it is difficult if not impossible to determine how different drugs will react together.
Steroids come in two forms, either injectable or as tablets which are swallowed.