| | Most people do overtrain, and the "high volume" approach (as opposed to high intensity) is responsible for it. The reason sprinters are much more muscular than long-distance runners is because while the latter do more work, the former work more intensively -- i. e., they do hard work within a much briefer time span.
Long workouts (an hour or more) doing multiple sets of each exercise, and using lighter resistance, is aerobic; it doesn't really stimulate a lot of muscle growth, and over time such low-intensity, high-volume workouts deplete your recovery ability and lead to "overtraining." By contrast, brief, intense workouts doing single sets at higher resistance, and continuing each exercise to (or near) "failure," stimulates much more muscle growth, and faster.
However, Mentzer's argument that we should reduce training sessions to once a week, or even two weeks, might benefit highly trained individuals, but not most people. It's just not enough. In early stages of training (say, the first couple of years), two or three 30-minute sessions per week -- doing no more than about 10 intense, single-set exercises -- are about right for most people. That much volume and intensity stimulates muscle growth and (done quickly) has aerobic benefits, too, but won't overwhelm your recovery ability.
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