Whether you're first starting out running, or have been doing it for years, we all want to be better runners. We gauge "better" as running longer, and we tend to have mileage on our minds. If you ran three miles yesterday, you think, "I'll run four miles tomorrow." Increasing by mile increments may be too much for your body though. Doing too much too soon may put you at risk for injury or may set you up for failure. Making goals to increase your distance per workout is great, but do so in minute increments instead. It's a more gradual progression that will be easier on your joints and muscles, but also on your mind.