The term 'Bench Press Muscles, For Short' is an acronym for the four-letter word PECS. PECS stands for pectoralis major and minor, which are two of the main muscles used in the bench press exercise. The pectoralis major is a large, fan-shaped muscle located in the chest, while the pectoralis minor is a small, triangular muscle located beneath the pectoralis major. Together, these two muscles are responsible for the movement of the arms during the bench press exercise.