Are you swimming aimless laps without a real plan or purpose? This can lead to poor technique and little improvement in conditioning. When you head for the pool, make a plan for your workout. Drills for stroke improvement can not only make you faster, but also makes workouts more interesting and can benefit your muscles and joints with the variety of different planes of motion and different strokes. Add interval training to challenge your aerobic and anaerobic systems for improving speed. Workout with a group so you can be challenged by swimming with a goal and with better swimmers. Try using various types of equipment if you haven't already such as paddles, fins, or pull buoys. Any or all of these methods will keep you charged up about your swimming!