This program is designed for someone who is new to running, and wanting to take on the challenge of a Half-Marathon. There is an aerobic base period within the first four weeks before progression begin, along with testing both at the start and throughout the 12 weeks of training. This program is progressive, and allows very little room for error. This is a time-based program, so you can use this on the street, trail, or on the treadmill! I hope you enjoy the program!