Lunges are a good way to work on a players leg strength and also help to work on flexibility in the hips and lower back area. It is a pretty simple exercise to do, but it is a really good basketball exercise to do for players that want to improve their quickness, speed, etc. Lunges can be done on the court or in the weight room.
If you are looking to mix in some strength development into your on court basketball training then lunges are a great exercise to use. They can be done with just body weight and can be very effective. If you are looking to do the exercise in the weight room, you can add dumbbells or a barbell to the exercise to make it even more difficult. Just make sure that the players form is correct before adding weight, and if the form suffers from the adding of weight, just stick to body weight.