Circuit training is a popular form of exercise that involves performing a series of exercises in a specific order with minimal rest in between. Other synonyms for circuit training include interval training, high-intensity interval training (HIIT), cross-training, functional training, and resistance training. These types of workouts are effective at improving cardiovascular health, building strength and endurance, and burning calories. They are also adaptable for people of all fitness levels and can be modified to target specific muscle groups. Whether you prefer a traditional circuit format or a more intense HIIT session, there is a synonym for circuit training that can help you achieve your fitness goals.