Including variety in a workout routine is crucial for several reasons. It helps prevent boredom, making exercise more enjoyable and sustainable long-term. Variety also engages different muscle groups, reducing the risk of overuse injuries and promoting balanced muscle development. Additionally, changing workouts can lead to improved fitness gains by continually challenging the body and preventing plateaus. Lastly, incorporating various activities allows individuals to assess their interests and find what works best for them, enhancing motivation and commitment to fitness.