Although general overall fitness is a worthy goal, you need to include sport specific training in your workout routine if you want to improve and excel in a particular sport. It may sound obvious, but if you want to be a better soccer player, for example, you need to improve your technique and train the muscles used in soccer.
Plyometric drills provide a quick and easy way to add sport specific training to your workouts. Plyometrics are drills that are specific to different types of sports. The best time to do them is after you have finished an easy workout. Your muscles will be loose, but you won't be too exhausted to focus on form.
One example of a plyometric drill is "High Knees." This drill helps improve running rhythm, so it is good training for running, and running-related sports such as soccer, lacrosse or field hockey. You'll work the lower legs, quads, hip flexors and glut muscles.
Here's how to do it:

• Lift your knees as close to waist level as you can while taking short, quick strides.
• Try to stay forward on your feet and move quickly and lightly as if walking on ice.
• Use your arms, but don't let them swing across your body.
• Start with a modest distance (25 meters or so) and increase the distance as you feel more comfortable with the movement.
• Don't go too fast. The goal is to lift your knees and keep each stride quick, not to cover the distance as fast as possible.