Keep playing until the offense scores or the defense gets the ball. Award one point for getting the loose ball, and another point for the scores.
We refer to them as "scrums"... diving on loose balls. Securing a few loose balls (for a few extra possessions) can make all the difference in a close game ... plus it sets a tone of "scrappiness" and toughness. A great hustle play is often a great team motivator and energizer. Here are a few loose ball drills.
Hustle Drill #1
This is a good drill for emphasizing hustle and going for loose balls. It also works one-on-one offensive skills, man-to-man defensive skills, and rebounding. A "laid back" player can actually be taught to hustle and get after the ball and the opponent.