Slowtwitch.com '); } else { document.write(' " Polarized training" is a macro-scale approach to training plan structure that emphasizes either very high or very low intensity training, with little-to-no time spent at moderate intensity. For a great review of the physiological concepts, TrainerRoad has a very thorough article with many linked research articles. The strictly quantitative approach to polarized training is important, and it's a very logical foundation for something like TrainerRoad, which exists (almost) solely in the quantitative space. But I think that it's a limited approach, and I think it misses out on including a major aspect of successful training - what I'll call a "qualitative" approach. Brett Sutton is notorious for a seemingly purely qualitative approach (at least superficially) with his