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Polarised training in practice

polaryzacja1
Source: Twitter,  as above :)



polaryzacja3
Source: Billat et al. Physical and training characteristics of top-class marathoners (2:06-2:11). Med. Sci. Sports Exerc. 2001
via Stephen Seiler  @ ITU Triahlon & Science Conference, Magglingen 2013​



polaryzacja2
Source: Billat et al. Training and bioenergetic characeristics of Elite Male and Female Kenyan Runners, 2003
via Stephen Seiler  @ ITU Triahlon & Science Conference, Magglingen 2013