But you will have to move more quickly to get your pulse up. As your pace goes up, so will your distance. If when you started you could run 15 laps in 20 minutes, after six weeks you may find yourself going 20 laps. You do not have to push yourself to go further. Just notice improvements that come naturally from your regular exercise.
Rewards are important.
In the beginning, exercise itself is probably not a powerful enough reward. Until it becomes one, you need to reward yourself. Do not wait a couple of months to do it. Do something special to celebrate five straight weeks of exercise, your own goal reached, or special progress you have made. Have an answer for your excuses.