To adjust your workout routine for different fitness levels, tailor the intensity, duration, and complexity of exercises to match individual capabilities and goals. Beginners should start with lighter weights, shorter durations, and simpler exercises, focusing on proper form and technique. Intermediate exercisers can gradually increase intensity, volume, and complexity as they build strength, endurance, and confidence. Advanced exercisers can challenge themselves with heavier weights, longer durations, and more advanced exercises or training techniques to continue progressing and avoiding plateaus. Listen to your body, and adjust your routine as needed to accommodate changes in fitness level, goals, and preferences.