Final answer:
Stimulant drugs such as cocaine, amphetamines, and caffeine increase energy and physical activity by affecting the dopamine neurotransmitter system and adenosine activity.
Step-by-step explanation:
Stimulant drugs that increase energy and physical activity include cocaine, amphetamines (including methamphetamine), cathinones (bath salts), MDMA (ecstasy), nicotine, and caffeine.
These drugs act as agonists of the dopamine neurotransmitter system, which is associated with reward and craving.
For example, caffeine, found in many common beverages and foods, is used to maintain increased levels of alertness and arousal by antagonizing adenosine activity.
Learn more about drugs that increase energy and physical activity