standardized workouts could be more injurious: To be clear, Maffetone never argued against occasionally entering into anaerobic exercise. Rowing, lifting weights, and running can all have a profound effect on strength and endurance. But to be effective, these exercises needed to be kept in context of larger training, and can’t be prioritized over aerobic training. High-intensity interval training only works because well-designed programs are built around spending the vast majority of time in periods of slower, gentler aerobic exercise. Author and fitness trainer Brian MacKenzie argues that the
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