Endorphins are natural chemicals produced by the body that act as painkillers and mood boosters. These neurotransmitters interact with the same receptors in the brain as opioids, creating a sense of pleasure and euphoria. Synonyms for endorphins include "happy hormones," "feel-good chemicals," "brain's natural reward system," and "natural painkillers." Other terms such as "runner's high" and "yoga bliss" are also often used to describe the effects of endorphins. Regular physical activity, social interaction, and laughter have been found to be linked to the release of endorphins and can lead to improved mental and physical well-being.