Professional rivalries often seem like the ultimate waste of time. Why is she spending so much time worrying about what someone else is doing? Why doesn’t she focus on her own business? Doesn’t she have anything better to do? It’s true that obsessing about a competitor isn’t the healthiest long-term activity. But I’ve also come to believe you can glean important lessons from the very act of rivalry — if you use it as an opportunity for growth, rather than just an opportunity to crush your enemies.

via Updates: What You Can Learn from Your Professional Rivals.