Body marking is when an athlete’s racing number is written on their body, typically on their shoulders, arms, or legs. It is used in triathlons and in open-water swims. Officials can identify athletes as can spectators from the body markings.
In races without a bib, such as the swim portion of a triathlon, athletes are marked on their bodies. This is typically with black, waterproof markers and can include the athlete’s age group on their calf as well. This assists marshals in identifying rule infractions and allows competitors to know who they are racing. This makes swimmers easier to spot in larger groups as well. Although temporary, the process of marking is an essential component of triathlon organization and ensures the event is well-organized as well as fair.
