Inclusion Criteria:  Between the age of 21 and 40. Weigh more than 110 pounds Habitual user of cannabis; average use of THC minimum of once per month during the previous year Prior use of cannabis product containing at least 10 mg of THC with no adverse reaction Habitual exerciser: exercised a minimum of 5 days per week, for a minimum of 30-minutes/session, during the previous year.  Exclusion Criteria:  Identification of a contra-indication to exercise during a 12-lead exercise stress test. Pregnant or trying to become pregnant. Breastfeeding. Recipient of treatment for psychotic or bipolar disorder during the previous 2 years Recipient of treatment for Schizophrenia during the previous 2 years Planned surgery scheduled within 2-weeks of study participation