The term 'Firms Muscles' can be broken down into two separate words. The first word, 'Firms, ' is a five-letter word meaning to make something stronger or more solid. The second word, 'Muscles, ' refers to the body's muscles, which are responsible for movement and posture. Together, the two words form a phrase that describes the process of strengthening and toning the body's muscles. This can be done through exercise, stretching, and other physical activities.