The effectiveness of a workout routine can be determined by measuring progress indicators such as improvements in strength, endurance, flexibility, and body composition. Tracking key metrics like weights lifted, distance run, or repetitions performed provides tangible evidence of advancements. Also, regular self-assessments can help individuals stay motivated and make necessary adjustments to their training plans. Ultimately, consistent monitoring of these measurements ensures that individuals are on track toward their fitness goals, leading to long-term success.