I had excellent results with the 24 week plan. My fitness level going into it was not great, and my training was very scattered, mostly consisting of running once in a while and climbing local mountains on weekends. It provided a structure that had been sorely lacking, and forced me to work on critical aspects of fitness that I typically ignored, particularly core and strength training, and above all, consistency. Many evenings I’d head out to the gym or a run, knowing that if I didn’t, the calendar would light up red the next day showing a missed session.