Should Zone 2 training be comprised of steady-state efforts, or does introducing short surges at high intensities offer additional physiological benefits that can enhance endurance performance. Some proponents of traditional Zone 2 training argue that maintaining a consistent power output or heart rate allows for optimal aerobic adaptation and fat metabolism, whereas incorporating short surges may inadvertently push athletes into higher intensity zones, compromising the aerobic benefits of the workout.
On the other hand, advocates of surging within Zone 2 training suggest that brief, high-intensity efforts can improve neuromuscular function, enhance muscular recruitment patterns, and increase mitochondrial density, ultimately leading to greater improvements in endurance performance.
What is the optimal approach to Zone 2 training, and are there specific situations or physiological adaptations where one method is preferred over the other.