Stop running your easy days too hard and your hard days too easy. Targeted at intermediate runners looking to improve their 5K time, this 12-week plan introduces a critical 5th day of running to build structural resilience and expand VO2 Max-specific pacing. It also introduces Fast Finish runs—long-weekend efforts that conclude with a sustained, moderate-to-high-intensity block (Zone X, 3, or 4) to teach your body to maintain a strong pace under heavy aerobic fatigue. What It Delivers: Exact ...