Fitness centers are places where people can go to stay in shape and improve their overall health. Gyms, or four-letter establishments, offer a variety of exercise equipment and classes for people to use. ABS, or three-letter establishments, focus on abdominal exercises and core strength. SPAs, or four-letter establishments, provide a relaxing atmosphere with massage, saunas, and other treatments. YMCAs, or five-letter establishments, are community-based organizations that offer a wide range of activities, including fitness classes, swimming, and sports. All of these establishments provide a great way for people to stay fit and healthy.