Pushing yourself to be better certainly isn't wrong; it's something coaches try to inspire in players. However, there is a big difference between pushing to be better THAN your teammates (the I'm-better-than-you attitude, which can cause jealousy and resentment), and trying to be better FOR your teammates (the if-I'm-better-it-makes-the-whole-team-better-attitude, which inspires mutual support and common goals).
