Unfortunately because we are human our body sometimes performs well and other times not as well. This can just be a bad day, a bad week or a bad season. Trying to push the body when its not ok or worse still when its carrying injuries will ususally not work and probably cause irritation and annoyance. Although it doesn't seem connected emotional problems and inner conflicts can reduce your sporting performance. If you have these there is usually no need to rush off to a therapist and spent many hours on a couch discussing many issues.
Most illegal drugs are illegal for a good reason they usually have very unpleasant side affects.
This group includes body building drugs and recreational drugs, like cocaine. If you use them expect in time your bodt performance's will deteriorate and you may end up with long term medical problems. A warm-up routine is essential to raise the body tempertaure by using all the major muscle groups thereby increasing blood flow and elasticity of muscle tissue and allowing more oxygen to be carried to the working muscles. This will prepare the body for the activity to follow. This will also improve performance and reduce the risk of injury.