Signs that you may need to change your workout routine include persistent fatigue, lack of progress, or loss of enthusiasm for exercising. If workouts start to feel monotonous or too challenging, it may indicate the need for modifications. Additionally, experiencing frequent injuries or excessive soreness can suggest that your body requires varied intensity or recovery strategies. Monitoring energy levels and motivation is essential; if either decreases, refreshing your routine with new exercises or goals can promote better results and enjoyment.