What accidental habits are you teaching your players by the drills that you do regularly?

For example:

A warm up drill that is done regularly in my trainings is the “back court hitting drill”, fairly self explanatory. However, this drill, if not done right has the ability to create a poor defensive pattern. If the players do not reset back to the “neutral”defensive position every time the ball goes back on the opposite side of the net then the players are training to defend in a line. Not the ideal position when playing games.

My habits while coaching are changing, I am forever looking at the drills I design and make sure that they are fostering habits that I want the players to have when they are playing games!

The old cliché “train how you want to play”. So, I ask the question again, “What accidental habits are you teaching your players by the drills that you do?