The general term used to refer to a chemical that alters a person's mood or behavior when it is drunk, smoked, inhaled, injected or taken in a pill form.

During the past few weeks or months, have you noticed any exercises that have become too easy for you? do you think you need to increase the intensity in any of the three exercise areas in your workouts? evaluate your exercise progress in the three exercise areas (cardiovascular, resistance, and flexibility) and list what modifications, if any, you may need to make in your exercise routine.