Stigma surrounding periods still exists and is impacting athletes’ health, with reports of over a third of athletes ignoring a missed period, which can be a symptom of RED-S (relative energy deficiency in sport), a condition that leads to disordered eating, deteriorating bone density, irritability, recurring injuries, and gastrointestinal issues. Research is starting to take place into how athletes can train with, rather than against, their menstrual cycles. The US women’s football team attribute their 2019 World Cup win to tracking their cycles and shaping training around what stage an athlete was at in her cycle. But there are still more questions to answer.