Adapted from the book Running Periodization: Training Theories to Run Faster, by Dr. Karp. “For long races, it may be better to train speed first, and then train the endurance to sustain a high fraction of that speed.” Historically, linear periodization was designed to improve strength, speed, and power, and so the training progressed from general conditioning (volume) to specific skills (intensity), with the highest intensity coming at the end of the training program.