I realize how often I've held onto pains that other people inflicted on me for days, weeks, even years. It was partly because I did not know any other way, and partly because I felt justified in my anger. But it was also because forgiveness does not always come as easily as it did in this one instance.
Have you ever felt a race slipping away from you after a strong start? Have you been passed, or run out of gas, just a mile or two from the finish line? Every runner can benefit from increased endurance. Tempo runs are just the thing to help you become better at running faster for longer periods of time.