The four main types of exercise are aerobic, strength training, flexibility, and balance exercises. Aerobic exercise, such as running, swimming, or cycling, focuses on improving cardiovascular health and endurance. Strength training targets muscle growth and tone through resistance exercises, while flexibility workouts enhance the range of motion in joints and muscles, promoting mobility. Balance exercises are crucial for stability and coordination, particularly in older adults, helping to prevent falls. Incorporating all four types into a fitness routine yields comprehensive health benefits and supports overall well-being.