Runner’s World magazine today announced the release of its SmartCoach iPhone app, which creates customized training guides for race distances between a 5-K and a marathon. Users can input their most recent race time, weekly and long-term distance goals, training level (maintenance, moderate, hard or very hard), the day they’d like to schedule their long runs and the amount of time they’d like to train for (up to 16 weeks) to receive their customized plan. The app suggests a running distance and pace that varies each day, increasing in distance and speed and then tapering off shortly before race day.