In one of his early studies, Seiler collected and analyzed data on the training of twelve elite junior cross-country skiers. He found that 75 percent of their workouts were devoted entirely to low-intensity training. When Seiler mixed all of the workouts together and looked at the actual time spent at each level of intensity, he saw that 91 percent of their total training time was spent below the ventilatory threshold. In other words, the skiers devoted slightly less than 80 percent of their workouts to low-intensity work and spent a little more than 80 percent of their total training time at
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