The newer you are to running, ideally the longer you have for the training,” says Dani Sturtz, an RRCA-certified run coach.

To go sub-4, you should be capable of running a sub-1:50 half marathon and a sub-50 10K. Before starting this training plan, you should be running at least 20 miles per week and be able to run ...

If you’re starting from scratch and don’t want to put both your mind and body under huge stress, you’ll want 16 weeks or more to go from couch to half marathon. If you’re already ...