What is the appropriate action when a black flag is displayed due to WBGT temperature?

When a black flag is displayed due to a WetBulb Globe Temperature (WBGT) reading, it indicates extreme heat conditions that pose a serious risk to participants' health and safety. This designation typically means that conditions are such that the risk of heat-related illnesses is very high. In this scenario, canceling all outdoor exercise is the most appropriate action to ensure the well-being of athletes and participants.

Choosing to cancel outdoor activities helps prevent heat exhaustion, heat stroke, and other heat-related injuries that could arise from continued exertion in severe environmental conditions. The black flag serves as a crucial warning sign illustrating the need for proactive measures to protect individuals from the harmful effects of extreme heat. In contrast, options like continuing exercises or merely limiting them could expose individuals to danger, and moving exercises indoors might not address the severity of conditions defined by the black flag signal, which calls for a complete cessation of outdoor activity.