To me, nothing is quite as satisfying as having sore muscles the day after a workout. My body seems to be saying “Man…good work! We’re getting stronger!” So when I wake up the morning after spending 90 minutes at the gym the day before and I’m not sore, it’s really kind of a let down. But is it necessarily a bad thing? And how should I modify my routine if that happens? More reps? More weight? New exercises?