The term 'run at full speed' can be summarized by two crossword solutions: SPRINT (6 letters) and CAREER (6 letters). Sprinting is a form of running that involves short bursts of high-intensity effort, while a CAREER is a long-term pursuit of a particular profession or field of study. Therefore, the term 'run at full speed' can be interpreted as either a short burst of intense effort or a long-term pursuit of a goal.