What is the origin of the idiom "pep talk" and when to use it?

The origin of the idiom "pep talk" can be traced back to the early 20th century, specifically within the realm of sports. The term "pep" refers to energy, enthusiasm, or vigor, and a "talk" denotes a conversation or speech. The phrase emerged as a way to describe the motivational speeches and discussions given to athletes before or during games to ignite their spirit, boost their morale, and enhance their performance. Coaches, trainers, or team leaders would deliver these talks to inspire and encourage players to give their best effort, overcome challenges, and maintain a positive mindset. It is commonly used in sports settings, including team sports, individual competitions, or athletic training, to rally athletes before a game, during halftime, or in moments of low morale.