In this episode we were joined by Matthew Klein who is a Physical Therapist based in California and is currently studying for his PhD. He runs 70-100 miles per week and has a 5k PB of 14:45 and a marathon PB of 2:32:44. He co-owns the brilliant Doctors of Running website and we spent the hour as three shoe nerds would - just talking shoes! How should we appraise shoes? What features matter (or don't)? How can we take our improved understanding of shoe design features and apply that pragmatically to the patients/athletes we see in clinic? And what do Craig and legendary basketball coach Phil Jackson have in common? All this and more.