You need to work initially with heavy weights to create a catabolic state in the body. Steroids are more effective in this situation. An athlete can only achieve this state on a regular basis with intense training. Training sessions must be progressive and work with the heaviest weights.
For example, in executing a set: if you are used to completing ten repetitions without the aid of a partner, then the workout has been carried out with a weight that’s too light.
Another issue is that even the experts often disagree about defining the duration of an effective training session. Some consider 20 minutes to be sufficient, while others suggest 3 hours. They nevertheless all agree that the two or three last repetitions in each series should not be carried out entirely on your own. That is true for both users of steroids and non-users.