Planning your training as a young middle or long-distance runner is a daunting task. What should your weekly workouts look like? How much mileage should you run? When is the right time to train speed? How fast is a tempo run? How do you ensure that you are on the right track for long-term development? Modern Training and Physiology for Middle and Long-Distance Runners answers these questions and many more. It is a short but detailed explanation of the practical aspects of exercise physiology: energy systems, the aerobic and anaerobic thresholds, VO2 max, running economy, muscle fibers, and more. In addition, it covers how these ideas inform both your day-to-day workouts and the underlying philosophy that forms the foundation of your training program. Following someone else’s training plan isn’t enough. You need to apply your own knowledge of training principles to improve your strengths, bolster your weaknesses, and ultimately become a better runner.