The app claims it will have you ready for a half marathon in just 12 weeks, taking you from running two to three miles all the way up to running 10 miles a week before your race. In the plan, you run three days a week, cross train two days, and rest two days. There are two shorter runs and one long run each week. While you're running, Hals voice offers you encouragement every few miles, which, on a particularly long run, is nice (especially when he starts calling out, you can do it, only 500 feet left!).