What is the origin of the idiom "hell for leather" and when to use it?

The idiom "hell for leather" is believed to have originated in the 19th century and likely comes from the world of horse racing. It describes a rider urging their horse to go as fast as possible by using a whip or spurs, often pushing the horse to its limits. This idiomatic phrase is used to describe someone or something moving or progressing at high speed, often with great determination and intensity. It conveys the idea of rapid and sometimes reckless movement.