I found during most of my sparring I am not fighting my opponent as much as I am fighting myself. All jokes aside, I am actually a very non-violent person. So, making a decision to actually hit someone, even as part of an exercise, is always a tough one for me. I understand it is important and necessary. One of my instructors used to say, "When you practice self-defense, you have to determine where your limit lies. What are you willing to do to protect yourself, your loved ones, or even a total stranger?" Having had some experience with real-life assaults, I know my adrenaline gets me where I need to be, but pounding someone in a training situation is still hard.