In the three-zone model of training intensity distribution, what does the second zone represent?

In the three-zone model of training intensity distribution, the second zone is represented by the values between LT1 (Lactate Threshold 1) and LT2 (Lactate Threshold 2). This zone is critical for training because it focuses on aerobic capacity and endurance development. Training in this range allows athletes to enhance their ability to sustain higher intensities for longer durations, improving their performance in more prolonged efforts.

Zone two is particularly vital for aerobic conditioning. It is often where most training volume is recommended for endurance athletes because it optimizes fat metabolism and improves cardiovascular efficiency. Athletes often train in this zone to enhance their performance without incurring excessive fatigue that might be present if training in the higher intensity zones.

The other choices wrongly depict the boundaries of the training intensity zones. The first zone refers to work below LT1, focusing on a lower intensity often termed as active recovery. The third zone, on the other hand, includes efforts above LT2, where the emphasis shifts toward more anaerobic efforts and higher intensity training. The choice suggesting above 100% VO2 pertains to an intensity significantly above maximal aerobic capacity, which is not representative of the second zone. Thus, the second zone's definition accurately uses the thresholds defined by LT1 and