Team Ineos (previously Team Sky and most recently Ineos Grenadiers) is the world’s greatest professional cycling team with seven Tour de France wins in its twelve year history. Fieldwork Facility joined a team of Performance Directors, Hygiene Experts and Behavioural Psychologists, together our challenge was to deliver a team-wide behaviour-change programme with an aim of losing Zero Days to avoidable illness throughout the pandemic and beyond. Team Ineos was already light years ahead of the field in terms of looking forensically at the role of hygiene in performance and how to control and prevent infection. Zero Days is a long established dogma within the team that riders missing training days due to infection can be the marginal difference in being able to medal on race day. Special focus is given to Zero Days around performance peaking for the grand tours (Tour de France, Giro d'Italia and La Vuelta a España).