Get Serious: A 12-Week Marathon Training Plan Creating a training plan that builds progressively over the 12 weeks is key to your success in training for a marathon in 3 months. Here’s a basic outline: Weeks 1-4: Build Base Mileage Start by establishing a solid foundation of weekly mileage. This period is about getting your body accustomed to the consistent workload without overdoing it 3 Month Marathon Training Pdf How Many Weeks To Train For A Marathon - And Great Plans To Use - Ready.Set. Marathon 12 Week Marathon Training Plan Pdf Most people would typically allow four to six months to prepare for their marathon. In this book, I show you how to compress your training into three months