80/20 running is a big thing with beginner runners and running training for a half marathon or a marathon, but it’s not the best way to make a training plan. Instead of the 80 20 running polarized training model, the pyramidal model has been proven to be much more effective.
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Study link: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6873141/
Study link: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6873141/