There are things that makes people energized, like adrenaline and other hormones. These things are called Stimulus and may be unlocked by a thought and imagination.
In psychology, a stimulus is any object or event that elicits a sensory or behavioral response in an organism.
The concept stimulus was essential to behaviorism and the behavioral theory of B. F. Skinner in particular. An eliciting stimulus was defined as a stimulus that precedes a certain behavior and thus causes a response. A discriminative stimulus in contrast increases the probability of a response to occur, but does not necessarily elicit the response. A reinforcing stimulus usually denoted a stimulus delivered after the response has already occurred; in psychological experiments it was often delivered on purpose to reinforce the behavior. Emotional stimuli were regarded as not eliciting a response. Instead, they were thought to modify the strength or vigor with which a behavior is carried out.