Spending a half an hour every day to exercise is great! But there's still 23.5 more hours left in that day. What you do in that 30 minutes doesn't exactly compensate for everything else you do in the other 23.5 hours of your day. Whether you're trying to break a world record or run your first 5k, it's not just what you do in that 30 minutes of exercise, but what you do in the 23.5 hours you don't exercise. Your lifestyle tells a lot about you, and it also supports what you truly want for your life. If you truly want to become more fit, then it should show in your lifestyle. Let your actions tell other people what you're going towards.