In this episode we had great fun with Alex Hutchinson talking about the running shoe/s which appears to have moved the needle more than any other shoe in history; the Nike Vaporfly/Next%/Alphafly. Do they come good on their marketing promise of improving runners by 4% (and what does that actually mean)? Where does the line between innovation and 'shoe doping' get drawn? Are they only for elite runners? All this and more.