In fitness, "cross-training" refers to the practice of incorporating various types of exercise or training modalities into one’s fitness routine. This approach aims to enhance overall fitness by working different muscle groups and improving different physical skills such as strength, endurance, flexibility, and balance. Cross-training can also prevent boredom, reduce the risk of overuse injuries, and allow for active recovery by mixing high-intensity workouts with lower-intensity activities. Ultimately, it leads to balanced fitness and improved performance in specific sports or activities.